1. Youth risk behavior surveillance—United States;Grunbaum;Morb Mortal Wkly Report,2002
2. Trends in pregnacy rates for the United States, 1976–97;Ventura;Natl Vital Stat Rep,2001
3. A statistical portrait of adolescent sex, contraception, and childbearing;Moore,1998
4. Contraception;Braverman;Clin Pediatr,1993
5. Contraceptive outcomes among post-partum and post-abortal adolescents;Blumenthal;Contraception,1994