共 19 条
[1]
CORNFIELD J, 1960, J Chronic Dis, V11, P523, DOI 10.1016/0021-9681(60)90016-3
[3]
ELIASSON RM, 1971, THESIS U LUND
[4]
ELMROS T, 1976, THESIS UMEA U
[5]
ESCHENBACH D A, 1975, Clinical Obstetrics and Gynecology, V18, P35, DOI 10.1097/00003081-197503000-00006
[6]
FAULKNER WL, 1975, APR ANN EP INT SERV
[8]
FLEISS JL, 1973, STATISTICAL METHODS
[10]
JENNINGS J, 1974, REPORT SAFETY EFFICA, V16, P29