18. Olausson PM, Cnattingius S, Goldenberg RL. Determinants of poor pregnancy outcomes among teenagers in Sweden. Obstet Gynecol 1997; 89:451.

19. Rees JM, Lederman SA, Kiely JL. Birth weight associated with lowest neonatal mortality: infants of adolescent and adult mothers. Pediatrics 1996; 98:1161.

20. Phipps MG, Blume JD, DeMonner SM. Young maternal age associated with increased risk of postneonatal death. Obstet Gynecol 2002; 100:481.

21. Paranjothy S, Broughton H, Adappa R, Fone D. Teenage pregnancy: who suffers? Arch Dis Child 2009; 94:239.

22. Malabarey OT, Balayla J, Klam SL, et al. Pregnancies in young adolescent mothers: a population-based study on 37 million births. J Pediatr Adolesc Gynecol 2012; 25:98.

23. Ganchimeg T, Ota E, Morisaki N, et al. Pregnancy and childbirth outcomes among adolescent mothers: a World Health Organization multicountry study. BJOG 2014; 121 Suppl 1:40.

24. Traisrisilp K, Jaiprom J, Luewan S, Tongsong T. Pregnancy outcomes among mothers aged 15 years or less. J Obstet Gynaecol Res 2015; 41:1726.

25. Brosens I, Muter J, Gargett CE, et al. The impact of uterine immaturity on obstetrical syndromes during adolescence. Am J Obstet Gynecol 2017; 217:546.

26. Paranjothy S, Broughton H, Adappa R, Fone D. Teenage pregnancy: who suffers? Arch Dis Child 2009; 94:239.

27. Maynard RA. Kids having kids: economic costs and social consequences of teen pregnancy, Urban Institute Press, Washington, DC 1997.

28. Nord CW, Moore KA, Morrison DR, et al. Consequences of teen-age parenting. J Sch Health 1992; 62:310.

29. Wiemann CM, Agurcia CA, Berenson AB, et al. Pregnant adolescents: experiences and behaviors associated with physical assault by an intimate partner. Matern Child Health J 2000; 4:93.

30. Harrykissoon SD, Rickert VI, Wiemann CM. Prevalence and patterns of intimate partner violence among adolescent mothers during the postpartum period. Arch Pediatr Adolesc Med 2002; 156:325.

31. Moffitt TE, E-Risk Study Team. Teen-aged mothers in contemporary Britain. J Child Psychol Psychiatry 2002; 43:727.

32. Assini-Meytin LC, Green KM. Long-term consequences of adolescent parenthood among African-American urban youth: a propensity score matching approach. J Adolesc Health 2015; 56:529.

33. Udo IE, Lewis Lmft JB, Tobin JN, Ickovics JR. Intimate Partner Victimization and Health Risk Behaviors Among Pregnant Adolescents. Am J Public Health 2016; 106:1457.

34. Bennell K, White S, Crossley K. The oral contraceptive pill: a revolution for sportswomen?. Br J Sports Med. 1999;33(4):231–238. doi:10.1136/bjsm.33.4.231.

35. Schaumberg MA, Emmerton LM, Jenkins DG, Burton NW, Janse de Jonge XAK, Skinner TL. Use of Oral Contraceptives to Manipulate Menstruation in Young, Physically Active Women. Int J Sports Physiol Perform. 2018; 13(1):82–87. doi:10.1123/ijspp.2016–0689.

36. Bonnema RA, McNamara MC, Spencer AL. Contraception choices in women with underlying medical conditions. Am Fam Physician. 2010; 82(6):621–628.

37. Glasier A. Acceptability of contraception for men: a review. Contraception. 2010; 82:453–456.

38. Mullin E. Men will soon test a sperm-stopping gel for birth control. MIT Technology Review. December 20, 2017. Source Accessed November 26, 2018.

39. U.S. National Library of Medicine. ClinicalTrials.gov.

Study of Daily Application of Nestorone® (NES) and Testosterone (T) Combination Gel for Male Contraception. ClinicalTrials.gov Identifier: NCT03452111.

40. U.S. National Library of Medicine. ClinicalTrials.gov.

Study of Serum Testosterone and Nestorone in Females After Secondary Exposure to Nestorone ® (NES) + Testosterone (T) Combined Gel Applied to Shoulders and Upper Arms in Males (CCN005B). ClinicalTrials.gov Identifier: NCT02994602.

41. Ilani N, Roth MY, Amory JK, et al. A new combination of testosterone and nestorone transdermal gels for male hormonal contraception. J Clin Endocrinol Metab. 2012; 97:3476–3486.

42. Roth MY, Shih G, Ilani N, et al. Acceptability of a transdermal gel-based male hormonal contraceptive in a randomized controlled trial. Contraception. 2014; 90:407–412.