Subjects: AEROSOLS; INDOOR air pollution; PASSIVE smokingBULGARIA; FRANCE; GERMANY
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Subjects: *SUBSTANCE abuse risk factors; *RESEARCH; *CANNABIS (Genus)AUSTRIA; GREECE; SLOVAKIA
Subjects: ANALYSIS of covariance; CULTURE; MOTIVATION (Psychology)BULGARIA; GERMANY; ITALY
Subjects: MEDICAL economics; HOSPITAL care; OUTPATIENT services in hospitalsBULGARIA; HUNGARY; LITHUANIA