The estimation of surgical risk.
D000367:Age Factors; D000368:Aged; D000758:Anesthesia / Q000401:mortality; D006304:Health Status; D006323:Heart Arrest / Q000517:prevention & control; D006801:Humans; D009747:Nutritional Physiological Phenomena; D011183:Postoperative Complications / Q000175:diagnosis* / Q000517:prevention & control; D012140:Respiratory Tract Diseases / Q000517:prevention & control; D012306:Risk; D013514:Surgical Procedures, Operative / Q000401:mortality*