title: Selection bias in the referral of patients and the natural history of surgical conditions.
mesh_terms: D000046:Academic Medical Centers; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D048909:Diabetes Complications; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010384:Pelvic Bones / Q000293:injuries; D011379:Prognosis; D012017:Referral and Consultation; D013514:Surgical Procedures, Operative; D014594:Uterine Neoplasms / Q000150:complications; D014656:Vascular Surgical Procedures