共 6 条
[1]
BEARD RW, 1974, PEDIATRICS, V53, P156
[2]
BENSON RC, 1968, OBSTET GYNECOL, V32, P259
[4]
PAUL RH, 1971, OBSTET GYNECOL, V37, P775
[5]
SCANLON JW, 1972, PEDIATRICS, V50, P934
[6]
WILKINSON JE, 1973, LANCET, V1, P559