共 27 条
[2]
Abrams R C, 1992, Clin Geriatr Med, V8, P309
[4]
BLAND JM, 1988, LANCET, P307
[6]
Boondas J, 1991, Nurs Health Care, V12, P308
[8]
Cohen J., 1988, STAT POWER ANAL BEHA, P285