共 32 条
[1]
Babbie E., 1994, Survey research methods, V2nd
[4]
Bland J.M., 1988, LANCET, V1, P307
[6]
A NEW METHOD OF CLASSIFYING PROGNOSTIC CO-MORBIDITY IN LONGITUDINAL-STUDIES - DEVELOPMENT AND VALIDATION
[J].
JOURNAL OF CHRONIC DISEASES,
1987, 40 (05)
:373-383
[9]
Douglas S L, 1997, Am J Crit Care, V6, P99