Prevalence of physical illness in parents of identical twins discordant for schizophrenia.
D000293:Adolescent; D000328:Adult; D000368:Aged; D004200:Diseases in Twins; D004522:Educational Status; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009017:Morbidity; D009790:Occupations; D010290:Parents; D012561:Schizophrenia, Childhood; D012923:Social Class; D013315:Stress, Psychological; D013959:Thyroid Diseases