1995b-344 1995g-785 adolescent adolescentbehavior adolescenthealthservices birthcontrol child childwelfare control developingcountries governmentpolicy healthandhygiene healthbehaviorinadolescence healtheducation healthpromotion infant infantwelfare medicalcare methods pregnancyinadolescence prevention preventivehealthservices preventivehealthservicesforchildren schoolhealthservices sexinstructionforteenagers sexuallytransmitteddiseases teenagegirls teenagepregnancy teenagers unitedstates wa320b8561994 ws462