共 52 条
[2]
ABRAHAM S, 1988, VITAL HLTH STATIS 11, V230
[4]
ANDRES R, 1985, PRINCIPLES GERIATRIC, P311
[5]
BRADDON FEM, 1986, BRIT MED J, V193, P299
[10]
DIXON WJ, 1990, BMDP STATISTICAL SOF, V2