[Initial drugs and drug sequences. Results of an empirical analysis of drug abuse].
D000293:Adolescent; D000662:Amphetamines; D001463:Barbiturates; D002188:Cannabis; D005860:Germany, West; D006801:Humans; D013334:Students; D019966:Substance-Related Disorders / Q000453:epidemiology; D011795:Surveys and Questionnaires
D000662:Amphetamines; D001463:Barbiturates
Einstiegsdrogen und Drogensequenzen. Ergebnisse einer empirischen Analyse zum Rauschmittelkonsum