1Singh S, Sedgh G, Hussain R (2010) Unintended pregnancy: worldwide levels, trends and outcomes. Stud Fam Plann 41:241-50.
2Cibula, D (2008) Women's contraceptive practices and sexual behaviour in Europe. Eur J Contracept Reprod Health Care 13: 362-75.
3Lete I, Hassan F, Chatzitheofilou I, Wood E, Mendivil J, et al. (2015) Direct costs of unintended pregnancy in Spain. Eur J Contracept Reprod Health Care 20(4):308-18.
4Spanish population. https://www.ine.es/censos_datos/ cen_datos_inicio.htm. Accessed on 12 October 2017.
5Abortion in Spain. https://www.msssi.gob.es/profesionales/ saludPublica/prevPromocion/embarazo/tablas_figuras. htm. Accessed on 2 January 2018.
6Surveys on contraception use. www.grupodaphne. com/encuestas.php. Accessed on 16 October 2017.
7Surveys on contraception use. https://sec.es/area-cientifica/ observatorio/documentos-observatorio/. Accessed on 16 October 2017
8Dueñas JL, Lete I, Bermejo R, Arbat A, Pérez-Campos E, et al. (2011) Trends in the use of contraceptive methods and voluntary interruption of pregnancy in the Spanish population during 1997–2007. Contraception 82–87
9Trussell J. (2011) Contraceptive failure in the United States. Contraception 83: 397-404.
10Collins A, Jones K, Paglisotti T. (2018) Exploring Gender Norms and Relation to Condom and Contraceptive Use Attitudes among Adolescent Girls in Low-Resource Neighbourhoods. J Adolesc Health 62:S64.
11Darroch, JE. (2013) Trends in contraceptive use. Contraception 87:259-63.
12Darroch JE, Singh S. (2013) Trends in contraceptive need and use in developing countries in 2003, 2008, and 2012: an analysis of national surveys. The Lancet 381:1756-62.
13Serrano I, Doval JL, Lete I et al. (2012) Contraceptive practices of women requesting induced abortion in Spain: A cross-sectional multicentre study. Eur J Contracept Reprod Health Care 17: 205–11.
14Matsumoto, Y, Yamabe S. (2010) After 10 years: has approval of oral contraceptives really decreased the rate of unintended pregnancy in Japan? Contraception 81:389-90.
15Sato R, Iwasawa M. (2006) Contraceptive use and induced abortion in Japan: How is it so unique among the developed countries? Japan J Popul 4:33-54.
16Lete I, Doval JL, Pérez-Campos E et al. (2008) Selfdescribed impact of noncompliance among users of a combined hormonal contraceptive method. Contraception 77:276– 282.
17Sedgh G, Singh S, Shah IH et al. (2012) Induced abortion: incidence and trends worldwide from 1995 to 2008. The Lancet 379:625-32.
18Gissler M, Fronteira I, Jahn A et al. (2012) Terminations of pregnancy in the European Union. BJOG: An International Journal of Obstetrics & Gynaecology 119:324-32.
19Part K, Moreau C, Donati S et al. (2013) Teenage pregnancies in the European Union in the context of legislation and youth sexual and reproductive health services. Act Obstet Gynecol Scand 92:1395-406.
20Dee DL. (2017) Trends in Repeat Births and Use of Postpartum Contraception Among Teens—United States, 2004–2015. MMWR Morbidity and Mortality Weekly Report :66.
21Lindh I, Andersson Ellström A, Blohm F, Milsom I. A (2010) longitudinal study of contraception and pregnancies in the same women followed for a quarter of a century. Hum Reprod 25:1415-22.
22Rowlands S. (2007) Contraception and abortion. J R Soc Med 100:465-8.
23Marston C, Meltzer H, Majeed A. (2005) Impact on contraceptive practice of making emergency hormonal contraception available over the counter in Great Britain: repeated cross-sectional surveys. BMJ; 331:271.
24Denisov BP, Sakevich VI, Jasilioniene A. (2012) Divergent trends in abortion and birth control practices in Belarus, Russia and Ukraine. PLoS One 7: e49986.
25Branum AM, Jones J. (2015) Trends in long-acting reversible contraception use among US women aged 15-44. US Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics.
26Lete I. What about compliance? Eur J Contracept Reprod Health Care 2010; 15:217-9.