Columbia subject headings:
Drug abuse--Complications--Congresses.
Drug tolerance--Congresses.
Psychopharmacology--Congresses.
Harvard subject headings:
Drug abuse--Complications--Congresses.
Drug tolerance--Congresses.
Psychopharmacology--Congresses
Princeton subject headings:
Drug abuse--Complications--Congresses.
Drug tolerance--Congresses.
Psychopharmacology--Congresses.