REFERENCES
- Spitz AM, Velebil P, Strauss LT, et al. Pregnancy, abor- tion and birth rates among US adolescents – 1980, 1985, and 1990. J Am Med Assoc 1996;275:989–94
- Ministerio de Sanidad y Consumo del Estado Espa ol. Informe sobre interrupción voluntaria del embarazo, Madrid, 1997: 21, 32
- Ministerio de Salud Pública de Cuba. Anuario estadístico. Ciudad Habana, 1999
- Creinin MD, Wiebe E, Gold M. Methotrexate and misoprostol for early abortion in adolescent women. J Pediatr Adolesc Gynecol 1999;12:71–7
- Carbonell JLL, Varela L, Velazco A, Fernandez C. The use of misoprostol for termination of early pregnancy. Contraception 1997;55:165–8
- Carbonell JLL, Varela L, Velazco A, Fernández C, Sánchez C. The use of misoprostol for abortion of 9 weeks gestation. Eur J Contracept Reprod Health Care 1997;2:181–5
- Carbonell JLL, Varela L, Velazco A, Cabezas E, Tanda R, Sánchez C. Early abortion with 800 g of misoprostol by the vaginal route. Contraception 1999;59:219–25
- Velazco A, Varela L, Tanda R, et al. Misoprostol for abortion up to 9 weeks gestation in adolescents. Eur J Contracept Reprod Health Care 2000;5:227–33
- Carbonell JLL, Varela L, Velazco A, Cabezas E, Tanda R, Sánchez C. Vaginal misoprostol for late first trimes- ter abortion. Contraception 1998;57:329–33
- Carbonell JLL, Varela L, Velazco A, Tanda R, Sánchez Vaginal misoprostol for abortion at 10–13 weeks’ gestation. Eur J Contracept Reprod Health Care 1999; 4:1–6
- Ashok PW, Flett GM, Templeton A. Termination of pregnancy at 9–13 weeks amenorrhoea with mife- pristone and misoprostol. Lancet 1998;352:542–3
- Gouk EV, Lincoln K, Khair A, Haslock J, Knight J, Cruickshank DJ. Medical termination of pregnancy at 63 to 83 days gestation. Br J Obstet Gynaecol 1999; 106:535–9
- Hellman LM, Kobayashi M, Fillisti L, Lavenhar M, Cromb E. Growth and development of the human fetus prior to the twentieth week of gestation. Am J Obstet Gynecol 1969;103:789–98
- Winikoff B, Ellertson C, Clark S. Analysis of failure in medical abortion. Contraception 1996;54:323–7
- Donner A. Approaches to sample size estimations in the design of clinical trials. Stat Med 1984;3:199–214
- Carbonell JLL, Varela L, Velazco A, Tanda R, Sánchez Vaginal misoprostol for early second trimester abor- tion. Eur J Contracept Reprod Health Care 1998;3:93–8