title: X at the crossroads.
authors.affiliation: Epidemiologist, Communicable Diseases Center, Haight-Ashbury Free Clinics, Inc., San Francisco, California 94117.
authors.forename: J A
authors.initials: JA
authors.lastname: Newmeyer
mesh_terms: D015104:3,4-Methylenedioxyamphetamine / Q000031:analogs & derivatives*; D000328:Adult; D015198:Designer Drugs; D006801:Humans; D018817:N-Methyl-3,4-methylenedioxyamphetamine; D019966:Substance-Related Disorders / Q000523:psychology*; D014481:United States
chemical_list: D015198:Designer Drugs; D015104:3,4-Methylenedioxyamphetamine; D018817:N-Methyl-3,4-methylenedioxyamphetamine