Erratum: Before the beginning: nutrition and lifestyle in the preconception period and its importance for future health (The Lancet (2018) 391(10132) (1830–1841) (S0140673618303118) (10.1016/S0140-6736(18)30311-8));Before the beginning: nutrition and lifestyle in the preconception period and its importance for future health

The Lancet

Volumn 391, Issue 10132, 2018, Pages 1830-1841

  Stephenson, Judith ^a   Heslehurst, Nicola ^b   Hall, Jennifer ^a   Schoenaker, Danielle A J M ^c   Hutchinson, Jayne ^d   Cade, Janet E ^d   Poston, Lucilla ^e   Barrett, Geraldine ^a   Crozier, Sarah R ^f   Barker, Mary ^f,g   Kumaran, Kalyanaraman ^f,h   Yajnik, Chittaranjan S ⁱ   Baird, Janis ^f,g   Mishra, Gita D ^c  

^a UNIVERSITY COLLEGE LONDON   (United Kingdom)

^b NEWCASTLE UNIVERSITY   (United Kingdom)

^c UNIVERSITY OF QUEENSLAND   (Australia)

^d UNIVERSITY OF LEEDS   (United Kingdom)

^e ST THOMAS HOSPITAL   (United Kingdom)

^f UNIVERSITY OF SOUTHAMPTON   (United Kingdom)

^g SOUTHAMPTON GENERAL HOSPITAL   (United Kingdom)

^h CSI Holdsworth Memorial Hospital   (India)

ⁱ KEM HOSPITAL   (India)

Author keywords

[No Author keywords available]

Indexed keywords

AWARENESS; BODY COMPOSITION; CHILD HEALTH; DIET SUPPLEMENTATION; EMBRYO DEVELOPMENT; FAMILY PLANNING; HEALTH BEHAVIOR; HIGH INCOME COUNTRY; HUMAN; LIFESTYLE; LOW INCOME COUNTRY; MATERNAL AGE; MATERNAL NUTRITION; MATERNAL WELFARE; MIDDLE INCOME COUNTRY; NUTRITIONAL DEFICIENCY; OBESITY; POPULATION RESEARCH; PREGNANCY OUTCOME; PREPREGNANCY CARE; PRIORITY JOURNAL; REVIEW; RISK FACTOR; FEMALE; HEALTHY DIET; NUTRITIONAL STATUS; PREGNANCY; PREGNANCY COMPLICATION;

FEMALE; HEALTH BEHAVIOR; HEALTHY DIET; HUMANS; LIFE STYLE; NUTRITIONAL STATUS; PRECONCEPTION CARE; PREGNANCY; PREGNANCY COMPLICATIONS;

EID: 85045434034     PISSN: 01406736     EISSN: 1474547X     Source Type: Journal    
DOI: 10.1016/S0140-6736(18)30979-6     Document Type: Erratum

References (103)

1. Davies, SC, Annual report of the chief medical officer, 2014. The health of the 51%: women. 2015, Department of Health, London, 167.
2. Johnson, KA, Floyd, RL, Humphrey, JR, et al. Action plan for the national initiative on Preconception Health and Health Care (PCHHC)— a report of the PCHHC steering committee. 2012–14, Centers for Disease Control and Prevention, Atlanta, GA, 1–49.
3. Hanson, MA, Bardsley, A, Dr-Regil, LM, et al. The International Federation of Gynecology and Obstetrics (FIGO) recommendations on adolescent, preconception, and maternal nutrition: “Think Nutrition First”. Int J Gynaecol Obstet 131:suppl 4 (2015), S213–S253.
4. WHO. Preconception care: Maximizing the gains for maternal and child health. Policy brief. 2013, World Health Organization, Geneva, 1–8.
5. Lee, C, Dobson, AJ, Brown, WJ, et al. Cohort profile: the Australian Longitudinal Study on Women's Health. Int J Epidemiol 34 (2005), 987–991.
6. Crozier, SR, Robinson, SM, Borland, et al. Do women change their health behaviours in pregnancy? Findings from the Southampton Women's Survey. Paediatr Perinat Epidemiol 23 (2009), 446–453.
7. Inskip, HM, Godfrey, KM, Robinson, SM, et al. Cohort profile: the Southampton Women's Survey. Int J Epidemiol 35 (2006), 42–48.
8. Kumaran, K, Yajnik, P, Lubree, H, et al. The Pune Rural Intervention in Young Adolescents (PRIYA) study: design and methods of a randomised controlled trial. BMC Nutrition, 3, 2017, 41.
9. Bates, B, Lennox, A, Prentice, A, et al. National diet and nutrition survey: results from years 1, 2, 3, and 4 (combined) of the rolling programme (2008/2009–2011/2012). Executive summary. 2014, Public Health England, London.
10. Hall, JA, Barrett, Phiri, T, et al. Prevalence and determinants of unintended pregnancy in Mchinji District, Malawi; using a conceptual hierarchy to inform analysis. PLoS One, 11, 2016, e0165621.
11. Ben-Shlomo, Y, Kuh, D, A life course approach to chronic disease epidemiology: conceptual models, empirical challenges and interdisciplinary perspectives. Int J Epidemiol 31 (2002), 285–293.
12. De-Regil, LM, Peña-Rosas, JP, Fernández-Gaxiola, AC, Rayco-Solon, P, Effects and safety of periconceptional oral folate supplementation for preventing birth defects. Cochrane Database Syst Rev, 12, 2015 CD007950.
13. Mastroiacovo, P, Leoncini, E, More folic acid, the five questions: why, who, when, how much, and how. Biofactors 37 (2011), 272–279.
14. Hodgetts, VA, Morris, RK, Francis, A, Gardosi, J, Ismail, KM, Effectiveness of folic acid supplementation in pregnancy on reducing the risk of small-for-gestational age neonates: a population study, systematic review and meta-analysis. BJOG 122 (2015), 478–490.
15. Gao, Y, Sheng, C, Xie, RH, et al. New perspective on impact of folic acid supplementation during pregnancy on neurodevelopment/autism in the offspring children—a systematic review. PLoS One, 11, 2016, e0165626.
16. He, Y, Pan, A, Hu, FB, Ma, X, Folic acid supplementation, birth defects, and adverse pregnancy outcomes in Chinese women: a population-based mega-cohort study. Lancet, 388, 2016, S91.
17. Rao, R, Tkac, I, Townsend, EL, Gruetter, R, Georgieff, MK, Perinatal iron deficiency alters the neurochemical profile of the developing rat hippocampus. J Nutr 133 (2003), 3215–3221.
18. Tian, X, Anthony, K, Neuberger, T, Diaz, FJ, Preconception zinc deficiency disrupts postimplantation fetal and placental development in mice. Biol Reprod, 90, 2014, 83.
19. Hanson, M, Barker, M, Dodd, JM, et al. Interventions to prevent maternal obesity before conception, during pregnancy, and post partum. Lancet Diabetes Endocrinol 5 (2017), 65–76.
20. NCD Risk Factor Collaboration (NCD-RisC). Worldwide trends in diabetes since 1980: a pooled analysis of 751 population-based studies with 4·4 million participants. Lancet 387 (2016), 1513–1530.
21. Ng, M, Fleming, T, Robinson, M, et al. Global, regional, and national prevalence of overweight and obesity in children and adults during 1980–2013: a systematic analysis for the Global Burden of Disease Study 2013. Lancet 384 (2014), 766–781.
22. Poston, L, Caleyachetty, R, Cnattingius, S, et al. Preconceptional and maternal obesity: epidemiology and health consequences. Lancet Diabetes Endocrinol 4 (2016), 1025–1036.
23. Gesink Law, DC, Maclehose, RF, Longnecker, MP, Obesity and time to pregnancy. Hum Reprod 22 (2007), 414–420.
24. Marchi, J, Berg, M, Dencker, A, Olander, EK, Begley, C, Risks associated with obesity in pregnancy, for the mother and baby: a systematic review of reviews. Obes Rev 16 (2015), 621–638.
25. Turcksin, R, Bel, S, Galjaard, S, Devlieger, R, Maternal obesity and breastfeeding intention, initiation, intensity and duration: a systematic review. Matern Child Nutr 10 (2014), 166–183.
26. Kort, HI, Massey, JB, Elsner, CW, et al. Impact of body mass index values on sperm quantity and quality. J Androl 27 (2006), 450–452.
27. Kaati, G, Bygren, LO, Edvinsson, S, Cardiovascular and diabetes mortality determined by nutrition during parents' and grandparents' slow growth period. Eur J Hum Genet 10 (2002), 682–688.
28. Godfrey, KM, Reynolds, RM, Prescott, SL, et al. Influence of maternal obesity on the long-term health of offspring. Lancet Diabetes Endocrinol 5 (2017), 53–64.
29. Schummers, L, Hutcheon, JA, Bodnar, LM, Lieberman, E, Himes, KP, Risk of adverse pregnancy outcomes by prepregnancy body mass index: a population-based study to inform prepregnancy weight loss counseling. Obstet Gynecol 125 (2015), 133–143.
30. Yi, XY, Li, QF, Zhang, J, Wang, ZH, A meta-analysis of maternal and fetal outcomes of pregnancy after bariatric surgery. Int J Gynaecol Obstet 130 (2015), 3–9.
31. Galazis, N, Docheva, N, Simillis, C, Nicolaides, KH, Maternal and neonatal outcomes in women undergoing bariatric surgery: a systematic review and meta-analysis. Eur J Obstet Gynecol Reprod Biol 181 (2014), 45–53.
32. Johansson, K, Cnattingius, S, Näslund, I, et al. Outcomes of pregnancy after bariatric surgery. N Engl J Med 372 (2015), 814–824.
33. Tobias, DK, Zhang, C, van Dam, RM, Bowers, K, Hu, FB, Physical activity before and during pregnancy and risk of gestational diabetes mellitus: a meta-analysis. Diabetes Care 34 (2011), 223–229.
34. Aune, D, Saugstad, OD, Henriksen, T, Tonstad, S, Physical activity and the risk of preeclampsia: a systematic review and meta-analysis. Epidemiology 25 (2014), 331–343.
35. Zhang, C, Solomon, CG, Manson, JE, Hu, FB, A prospective study of pregravid physical activity and sedentary behaviors in relation to the risk for gestational diabetes mellitus. Arch Intern Med 166 (2006), 543–548.
36. Phelan, S, Hagobian, T, Brannen, A, et al. Effect of an internet-based program on weight loss for low-income postpartum women: a randomized clinical trial. JAMA 317 (2017), 2381–2391.
37. WHO, Food and Agricultural Organization of the United Nations. Guidelines on food fortification with micronutrients. 2006, World Health Organization, Geneva.
38. Black, RE, Victoria, CG, Walker, SP, et al. Maternal and child undernutrition and overweight in low-income and middle-income countries. Lancet 382 (2013), 427–451.
39. US AID, Strengthening Partnerships, Results, and Innovations in Nutrition Globally (SPRING). Nutrition of adolescent girls and women of reproductive age in low- and middle-income countries: current context and scientific basis for moving forward. Mar 16–17, 2015. 2015, SPRING, Arlington, VA.
40. Bath, SC, Steer, CD, Golding, J, Emmett, P, Rayman, MP, Effect of inadequate iodine status in UK pregnant women on cognitive outcomes in their children: results from the Avon Longitudinal Study of Parents and Children (ALSPAC). Lancet 382 (2013), 331–337.
41. Cordain, L, Eaton, SB, Sebastian, A, et al. Origins and evolution of the Western diet: health implications for the 21st century. Am J Clin Nutr 81 (2005), 341–354.
42. Public Health England. Government dietary recommedations. Government recommendations for energy and nutrients for males and females aged 1–18 years and 19+ years. 2016, Public Health England, London.
43. Cuskelly, GJ, McNulty, H, Scott, JM, Effect of increasing dietary folate on red-cell folate: implications for prevention of neural tube defects. Lancet 347 (1996), 657–659.
44. Harding, KB, Peña-Rosas, JP, Webster, AC, et al. Iodine supplementation for women during the preconception, pregnancy and postpartum period. Cochrane Database Syst Rev, 3, 2017 CD011761.
45. Bao, W, Bowers, K, Tobias, DK, et al. Prepregnancy low-carbohydrate dietary pattern and risk of gestational diabetes mellitus: a prospective cohort study. Am J Clin Nutr 99 (2014), 1378–1384.
46. Tobias, DK, Zhang, C, Chavarro, J, et al. Prepregnancy adherence to dietary patterns and lower risk of gestational diabetes mellitus. Am J Clin Nutr 96 (2012), 289–295.
47. Zhang, C, Schulze, MB, Solomon, CG, Hu, FB, A prospective study of dietary patterns, meat intake and the risk of gestational diabetes mellitus. Diabetologia 49 (2006), 2604–2613.
48. Schoenaker, DA, Soedamah-Muthu, SS, Callaway, LK, Mishra, GD, Pre-pregnancy dietary patterns and risk of gestational diabetes mellitus: results from an Australian population-based prospective cohort study. Diabetologia 58 (2015), 2726–2735.
49. Schoenaker, DA, Soedamah-Muthu, SS, Mishra, GD, Quantifying the mediating effect of body mass index on the relation between a Mediterranean diet and development of maternal pregnancy complications: the Australian Longitudinal Study on Women's Health. Am J Clin Nutr 104 (2016), 638–645.
50. Schoenaker, DA, Soedamah-Muthu, SS, Callaway, LK, Mishra, GD, Prepregnancy dietary patterns and risk of developing hypertensive disorders of pregnancy: results from the Australian Longitudinal Study on Women's Health. Am J Clin Nutr 102 (2015), 94–101.
51. Gresham, E, Collins, CE, Mishra, GD, Byles, JE, Hure, AJ, Diet quality before or during pregnancy and the relationship with pregnancy and birth outcomes: the Australian Longitudinal Study on Women's Health. Public Health Nutr 19 (2016), 2975–2983.
52. Grieger, JA, Grzeskowiak, LE, Clifton, VL, Preconception dietary patterns in human pregnancies are associated with preterm delivery. J Nutr 144 (2014), 1075–1080.
53. National Center for Chronic Disease Prevention and Health Promotion (US) Office on Smoking and Health. The health consequences of smoking—50 years of progress: a report of the surgeon general. 2014, Centers for Disease Control and Prevention (US), Atlanta, GA.
54. Reeves, S, Bernstein, I, Effects of maternal tobacco-smoke exposure on fetal growth and neonatal size. Expert Rev Obstet Gynecol 3 (2008), 719–730.
55. Been, JV, Nurmatov, UB, Cox, B, Nawrot, TS, van Schayck, CP, Effect of smoke-free legislation on perinatal and child health: a systematic review and meta-analysis. Lancet 383 (2014), 1549–1560.
56. British Medical Association (BMA). Alcohol and pregnancy: preventing and managing fetal alcohol spectrum disorders. June, 2007 (updated February, 2016). 2016, BMA, London.
57. CARE Study Group. Maternal caffeine intake during pregnancy and risk of fetal growth restriction: a large prospective observational study. BMJ, 337, 2008, a2332.
58. International Weight Management in Pregnancy Collaborative Group. Effect of diet and physical activity based interventions in pregnancy on gestational weight gain and pregnancy outcomes: meta-analysis of individual participant data from randomised trials. BMJ, 358, 2017, j3119.
59. Gardner, B, Wardle, J, Poston, L, Croker, H, Changing diet and physical activity to reduce gestational weight gain: a meta-analysis. Obesity Rev 12 (2011), e602–e620.
60. Campbell, F, Messina, J, Johnson, M, Guillaume, L, Madan, J, Goyder, E, Systematic review of dietary and/or physical activity interventions for weight management in pregnancy. 2010, The University of Sheffield School of Health and Related Research Public Health Collaborating Centre, Sheffield.
61. Muktabhant, B, Lawrie, TA, Lumbiganon, P, Laopaiboon, M, Diet or exercise, or both, for preventing excessive weight gain in pregnancy. Cochrane Database Syst Rev, 6, 2015 CD007145.
62. Dodd, JM, Cramp, C, Sui, Z, et al. The effects of antenatal dietary and lifestyle advice for women who are overweight or obese on maternal diet and physical activity: the LIMIT randomised trial. BMC Med 12 (2014), 161–180.
63. Flynn, AC, Seed, PT, Patel, N, et al. Dietary patterns in obese pregnant women; influence of a behavioral intervention of diet and physical activity in the UPBEAT randomized controlled trial. Int J Behav Nutr Phys Act, 13, 2016, 124.
64. Patel, N, Godfrey, KM, Pasupathy, D, et al. Infant adiposity following a randomised controlled trial of a behavioural intervention in obese pregnancy. Int J Obes 41 (2017), 1018–1026.
65. Chiswick, C, Reynolds, RM, Denison, F, et al. Effect of metformin on maternal and fetal outcomes in obese pregnant women (EMPOWaR): a randomised, double-blind, placebo-controlled trial. Lancet Diabetes Endocrinol 3 (2015), 778–786.
66. Syngelaki, A, Corapcioglu, D, Metformin versus placebo in obese pregnant women without diabetes mellitus. N Engl J Med 374 (2016), 434–443.
67. Sahariah, SA, Potdar, RD, Gandhi, M, et al. A daily snack containing leafy green vegetables, fruit, and milk before and during pregnancy prevents gestational diabetes in a randomized, controlled trial in Mumbai, India. J Nutr 146 (2016), 1453S–1460S.
68. Dean, SV, Lassi, ZS, Imam, AM, Bhutta, ZA, Preconception care: nutritional risks and interventions. Reprod Health, 11(suppl 3), 2014, S3.
69. Ramakrishnan, U, Grant, F, Goldenberg, T, Zongrone, A, Martorell, R, Effect of women's nutrition before and during early pregnancy on maternal and infant outcomes: a systematic review. Paediatr Perinat Epidemiol 26:suppl 1 (2012), 285–301.
70. Haider, BA, Bhutta, ZA, Multiple-micronutrient supplementation for women during pregnancy. Cochrane Database Syst Rev, 4, 2015, CD004905.
71. Devakumar, D, Fall, CH, Sachdev, HS, et al. Maternal antenatal multiple micronutrient supplementation for long-term health benefits in children: a systematic review and meta-analysis. BMC Med, 14, 2016, 90.
72. Graham, W, Woodd, S, Byass, P, et al. Diversity and divergence: the dynamic burden of poor maternal health. Lancet 388 (2016), 2164–2175.
73. Stoltzfus, R, Defining iron-deficiency anemia in public health terms: a time for reflection. J Nutr 131 (2001), 565S–567S.
74. Baker, PN, Wheeler, SJ, Sanders, TA, et al. A prospective study of micronutrient status in adolescent pregnancy. Am J Clin Nutr 89 (2009), 1114–1124.
75. Peña-Rosas, JP, De-Regil, LM, Garcia-Casal, MN, Dowswell, T, Daily oral iron supplementation during pregnancy. Cochrane Database Syst Rev, 7, 2015, CD004736.
76. De-Regil, LM, Palacios, C, Lombardo, LK, Peña-Rosas, JP, Vitamin D supplementation for women during pregnancy. Cochrane Database Syst Rev, 1, 2016, CD008873.
77. Cooper, C, Harvey, NC, Bishop, NJ, et al. Maternal gestational vitamin D supplementation and offspring bone health (MAVIDOS): a multicentre, double-blind, randomised placebo-controlled trial. Lancet Diabetes Endocrinol 4 (2016), 393–402.
78. Baird, J, Barker, M, Harvey, NC, et al. Southampton Pregnancy Intervention for the Next Generation (SPRING): protocol for a randomised controlled trial. Trials, 17, 2016, 493.
79. Potdar, RD, Sahariah, SA, Gandhi, M, et al. Improving women's diet quality preconceptionally and during gestation: effects on birth weight and prevalence of low birth weight—a randomized controlled efficacy trial in India (Mumbai Maternal Nutrition Project). Am J Clin Nutr 100 (2014), 1257–1268.
80. Potter, RG, Parker, MP, Predicting the time required to conceive. Population Studies 18 (1964), 99–116.
81. Gnoth, C, Godehardt, D, Godehardt, E, Frank-Herrmann, P, Freundl, G, Time to pregnancy: results of the German prospective study and impact on the management of infertility. Hum Reprod 18 (2003), 1959–1966.
82. Dean, S, Rudan, I, Althabe, F, et al. Setting research priorities for preconception care in low- and middle-income countries: aiming to reduce maternal and child mortality and morbidity. PLoS Med, 10, 2013, e1001508.
83. Brackenridge L, Finer N, Batterham RL, et al. Pre-pregnancy weight loss in obese women requesting removal of their intra uterine contraceptive device in order to conceive: a pilot study of full meal replacement. Clin Obes (in press).
84. Barrett, G, Shawe, J, Howden, B, et al. Why do women invest in pre-pregnancy health and care? A qualitative investigation with women attending maternity services. BMC Pregnancy Childbirth, 15, 2015, 236.
85. Stephenson, J, Patel, D, Barrett, G, et al. How do women prepare for pregnancy? Preconception experiences of women attending antenatal services and views of health professionals. PLoS One, 9, 2014, e103085.
86. Mitchell, EW, Levis, DM, Prue, CE, Preconception health: awareness, planning, and communication among a sample of US men and women. Matern Child Health J 16 (2012), 31–39.
87. Mosher, WD, Jones, J, Abma, JC, Intended and unintended births in the United States: 1982–2010. Natl Health Stat Report 55 (2012), 1–28.
88. Sedgh, G, Singh, S, Hussain, R, Intended and unintended pregnancies worldwide in 2012 and recent trends. Stud Fam Plann 45 (2014), 301–314.
89. The Demographic and Health Surveys Programme. Model women's questionnaire. Section 2 reproduction. Questions 405 and 406. https://dhsprogram.com/pubs/pdf/DHSQ7/DHS7-Womans-QRE-EN-07Jun2017-DHSQ7.pdf (accessed March 14, 2018).
90. Barrett, G, Smith, SC, Wellings, K, Conceptualisation, development, and evaluation of a measure of unplanned pregnancy. J Epidemiol Community Health 58 (2004), 426–433.
91. Rocca, CH, Krishnan, S, Barrett, G, Wilson, M, Measuring pregnancy planning: an assessment of the London Measure of Unplanned Pregnancy among urban, south Indian women. Demogr Res 23 (2010), 293–334.
92. Morof, D, Steinauer, J, Haider, S, Liu, S, Darney, P, Barrett, G, Evaluation of the London Measure of Unplanned Pregnancy in a United States population of women. PLoS One, 7, 2012, e35381.
93. Hall, J, Barrett, G, Mbwana, N, Copas, A, Malata, A, Stephenson, J, Understanding pregnancy planning in a low-income country setting: validation of the London measure of unplanned pregnancy in Malawi. BMC Pregnancy Childbirth, 13, 2013, 200.
94. Roshanaei, S, Shaghaghi, A, Jafarabadi, MA, Kousha, A, Measuring unintended pregnancies in postpartum Iranian women: validation of the London Measure of Unplanned Pregnancy. East Mediterr Health J 21 (2015), 572–578.
95. Borges, AL, Barrett, G, Dos Santos, OA, Nascimento Nde, C, Cavalhieri, FB, Fujimori, E, Evaluation of the psychometric properties of the London Measure of Unplanned Pregnancy in Brazilian Portuguese. BMC Pregnancy Childbirth, 16, 2016, 244.
96. Habib, MA, Raynes-Greenow, C, Nausheen, S, et al. Prevalence and determinants of unintended pregnancies amongst women attending antenatal clinics in Pakistan. BMC Pregnancy Childbirth, 17, 2017, 156.
97. Almaghaslah, E, Rochat, R, Farhat, G, Validation of a pregnancy planning measure for Arabic-speaking women. PLoS One, 12, 2017, e0185433.
98. Wellings, K, Jones, KG, Mercer, CH, et al. The prevalence of unplanned pregnancy and associated factors in Britain: findings from the third National Survey of Sexual Attitudes and Lifestyles (Natsal-3). Lancet 382 (2013), 1807–1816.
99. Goossens, J, van Den Branden, Y, van der Sluys, L, et al. The prevalence of unplanned pregnancy ending in birth, associated factors, and health outcomes. Hum Reprod 31 (2016), 2821–2833.
100. Bankole, A, Westoff, CF, The consistency and validity of reproductive attitudes: evidence from Morocco. J Biosoc Sci 30 (1998), 439–455.
101. FP2020 Partnership in Action 2012-2013, Family Planning 2020 Core Indicators. http://www.familyplanning2020.org/microsite/measurement-hub/whatwemeasure, 2013 (accessed March 14, 2018).
102. Centers for Disease Control and Prevention. Preconception health and reproductive life plan. https://www.hhs.gov/opa/title-x-family-planning/preventive-services/preconception-health-and-reproductive-life-plan/index.html (accessed March 14, 2018).
103. Rocca, C, Gould, H, Barar, R, Ralph, L, Rowlan, B, Foster, D, Operationalizing pregnancy preferences: development of a new instrument to measure strength of desire to avoid pregnancy. Contraception, 94, 2016, 423.