共 8 条
[2]
HAWES WE, 1976, WESTERN J MED, V124, P70
[4]
KLEINMAN JC, 1976, PUBLIC HEALTH REP, V91, P423
[5]
RYAN GM, 1975, OBSTET GYNECOL, V46, P375
[6]
SHAPIRO S, 1968, INFANT PERINATAL MAT, P83
[8]
1976, HLTH SERV RES, V11, P112