Subjects: Self Disclosure (Individuals); Error of Measurement; Recall (Psychology)Portugal
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Subjects: Drug Abuse; Sampling; Social NetworksUnited Kingdom (England)
Subjects: SUBSTANCE abuse; INTERNET; DRUG abuse
Subjects: Secondary School Students; College Students; Grade 8
Subjects: HEALTH education; SUBSTANCE abuse; PATIENT advocacy
Subjects: Adults; Crime; Drug AbuseDistrict of Columbia
Subjects: DRUG abuse; EPIDEMIOLOGYUNITED States