2009l-496 acquiredimmunodeficiencysyndrome aids(disease) alcoholismandemployment change(psychology) control counselingof drugabuse drugabusecounseling drugsandemployment druguse employeeassistanceprograms employees grouprelationstraining healthaspects healtheducation interpersonalrelations laborunions occupationalhealthservices peercounselingofstudents prevention psychology self-esteeminadolescence socialnetworks southafrica treatment youth