Coping with unwanted variables in cross-cultural research: examples from mental health and treatment of the aging.
D000328:Adult; D000368:Aged; D000375:Aging; D003431:Cross-Cultural Comparison; D006801:Humans; D001523:Mental Disorders / Q000523:psychology*; D008875:Middle Aged; D012106:Research; D014586:USSR; D014481:United States