Influence of age on measurement of health status in patients undergoing elective surgery.
Mangione CM, Marcantonio ER, Goldman L, Cook EF, Donaldson MC, Sugarbaker DJ, Poss R, Lee TH. Influence of age on measurement of health status in patients undergoing elective surgery. J Am Geriatr Soc. 1993 Apr; 41(4):377-83.