4van den Eeden SK, Shan J, Bruce C,et al. Ectopic pregnancy rate and treatment utilization in a large managed care organization [ J ]. Obstet Gynecol,2005,105 : 1052-1057.
5Tayal VS,Cohen H,Norton HJ. Outcome of patients with an indeterminate emergency department first-trimester pelvic ultrasound to rule out ectopic pregnancy [ J ]. Acad Emerg Med, 2004,11(9) :912-917.
6Kirk E, Papageorghiou AT, Condous G, et al. The diagnostic effectiveness of an initial transvaginal scan in detecting ectopie pregnancy [ J ]. Hum Reprod, 2007,22 ( 11 ) :2824-2828.
7Shih CC, Lee RK, Hwu YM. Cul-de-sac pregnancy following in vitro fertilization and embryo transfer[ J ]. Taiwan J Obstet Gynecol ,2007,46( 2 ) : 171-173.
8Flelscher AC, Stein SM, Cullinan JA, et al. Color Doppler sonography of adnexal torsion [ J ]. J Ultrasound Med, 1995,14 : 523-528.
9Pena JE, Ufberg D, Cooney N, et al. Usefulness of Doppler sonography in the diagnosis of ovarian torsion [ J ]. Fertil Steril, 2000,73 : 1047-1050.
10Vijayaraghavan SB. Sonographic whirlpool sign in ovarian tor- sion[ J]. J Ultrasound Med,2004, 23:1643-1649.