共 8 条
[3]
KRARUP T, 1982, ACTA CHIR SCAND, V148, P263
[5]
WILDER RJ, 1961, SURG GYNECOL OBSTET, V113, P205
[6]
1982, VITAL STATISTICS US
[7]
1977, SOURCEBOOK AGING, P1
[8]
1975, DHEW HRA751150 PHS P