共 14 条
[2]
ELLIS C, 1984, CONT OBSTETRICS, P19
[3]
ESKENAZI B, 1984, PERINATAL EPIDEMIOLO, P216
[6]
HANSON JW, 1984, CONT OBSTETRICS, P202
[7]
MEYER MB, 1977, EPIDEMIOLOGY PREMATU, P81
[8]
NELSON KB, 1981, PEDIATRICS, V68, P36
[9]
NELSON KB, 1986, NEW ENGL J MED, V315, P81, DOI 10.1056/NEJM198607103150202