adolescent adolescentbehavior adolescentdevelopment adolescenten adolescentmedicine adolescentpsychology adolescents attitudetohealth gezondheid healthandhygiene healthbehavior healthbehaviorinadolescence healthpromotion jeunesse medischepsychologie prisederisquechezl'adolescent promotiondelasante risiconemen risk-taking risk-taking(psychology)inadolescence risk-takinginadolescence santéethygiène socialwelfare teenagers youth