Article ISI
Journal of Pediatric and Adolescent Gynecology  (2009)

Comparative performance of a combined injectable contraceptive (50 mg norethisterone enanthate plus 5mg estradiol valerate) and a combined oral contraceptive (0.15 mg levonorgestrel plus 0.03 mg ethinyl estradiol) in adolescents.

Molina RC, Sandoval JZ; Montero AV, Oyarzun PG; Molina TG, Gonzalez EA