共 9 条
[1]
COLE GDH, 1955, STUDIES CLASS STRUCT, P149
[4]
Kettering H A, 1977, Trans Pac Coast Obstet Gynecol Soc, V44, P29
[6]
MEERS PD, 1981, J HOSPITAL INFECTI S, V2
[7]
POLK BF, 1982, AM J OBSTET GYNECOL, V142, P983
[9]
UNPUB HOSPITAL INPAT