Symptom alternation. An evaluation of the theory.
D002908:Chronic Disease; D003093:Colitis, Ulcerative / Q000150:complications*; D004777:Environment; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000150:complications*; D008297:Male; D011611:Psychosomatic Medicine; D011618:Psychotic Disorders / Q000150:complications*; D012559:Schizophrenia / Q000150:complications