共 9 条
[4]
1985, NCHS MONTHLY VITAL S, V33, P1
[5]
1985, NATIONAL CTR HLTH 20
[6]
1987, NATIONAL CTR HLTH 2
[7]
1987, STAT B METROPOL LIFE, V68, P20
[8]
1977, INT CLASSIFICATION D
[9]
1987, NATIONAL CTR HLTH 20