Methodological biases in estimating the burden of out-of-pocket expenses.
Goldman
D P
DP
RAND, Santa Monica, CA 90407-2138, USA.
Smith
J P
JP
D000368:Aged; D015982:Bias; D017281:Cost of Illness; D005853:Geriatrics / Q000191:economics*; D006801:Humans; D007182:Income; D012943:Social Security; D014481:United States