Contribution of twin studies to psychiatric nosology.
D000208:Acute Disease; D000275:Adjustment Disorders / Q000209:etiology / Q000235:genetics*; D000328:Adult; D001008:Anxiety Disorders / Q000209:etiology / Q000235:genetics*; D002908:Chronic Disease; D004200:Diseases in Twins; D005260:Female; D005823:Genetics; D006801:Humans; D008297:Male; D008875:Middle Aged; D009664:Norway; D011247:Pregnancy; D012931:Social Environment; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic