共 8 条
[1]
Clark S L, 1990, Obstet Gynecol Surv, V45, P360, DOI 10.1097/00006254-199006000-00003
[2]
GREGORY MG, 1973, OBSTET GYNECOL, V42, P236
[3]
LEWIS TLT, 1964, PROGR CLIN OBSTETRIC, P48
[6]
STEINER P. E., 1941, Journal of the American Medical Association, V117, P1340
[8]
THOMPSON WB, 1963, AM J OBSTET GYNECOL, V91, P606