The purchase of regression.
D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003068:Coercion; D005260:Female; D006693:Holidays; D006801:Humans; D008297:Male; D008875:Middle Aged; D012043:Regression, Psychology; D012179:Retirement; D012803:Sick Role; D019966:Substance-Related Disorders; D014937:Work