共 21 条
[1]
[Anonymous], 1996, MMWR Recomm Rep, V45, P1
[6]
DIRENZO GC, 2003, CONTROVERSIES OBSTET, P416
[7]
Edwards MS, 2000, PRINCIPLES PRACTICE, P2156
[8]
El-Kersh TA, 2002, SAUDI MED J, V23, P56