共 23 条
[3]
HILL WC, 1990, OBSTET GYNECOL, V76, pS13
[5]
THE CHANGING PATTERN OF LOW-BIRTH-WEIGHT IN THE UNITED-STATES - 1970 TO 1980
[J].
JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION,
1984, 251 (15)
:1978-1982
[6]
KOSASA TS, 1990, OBSTET GYNECOL, V76, pS71
[7]
LEVENO KJ, 1990, OBSTET GYNECOL, V76, P12
[10]
MAIN DM, 1987, OBSTET GYNECOL, V69, P61