共 7 条
[3]
EASTMAN NJ, 1950, WILLIAMS OBSTETRICS, P586
[4]
PAGE EW, 1954, OBSTET GYNECOL, V3, P385
[6]
STUDDIFORD WE, 1953, OBSTET GYNECOL, V1, P418
[7]
TATUM TJ, 1953, OBST GYNEC, V2, P447