1DONG J, SUI L, WANG Q, et al. Role of hysteroscopy in failed retrieval procedures of intrauterine device [J]. Progress in Obstet- rics and Gynecology, 2008, 17(1): 97. Chinese.
2SUN XY, WANG YL, CHEN Y. Clinical application of hys- teroscopy in diificult removal of intrauterine device [J]. Journal of Practical Obstetrics and Gynecology, 2007, 23 (10): 625-626. Chinese.
3YUE J. Obstetrics and gynecology [M]. 6th ed. Beijing: People's Medical Publishing House, 2004: 349. Chinese.
4GUO HF, ZOU F, GUO BZ, et al. Application of hysteroscopy combined ultrasound in difficult intrauterine device extraction [J]. Chinese Journal of Practical Gynecology and Obstetrics, 2006, 22 (5): 377-378. Chinese.
5XIA EL, FELIX W, LI ZX. Gynecological endoscopy[M]. Beijing: People's Medical Publishing House, 2001: 175. Chinese.
6i DUAN H. Hysteroscopy application, changes and development trend [J]. Chinese Journal of Practical Gynecology and Obstetrics, 2003, 19(11): 650-653. Chinese.
7YANG YL, CHEN J, LEI W. Occurrence and treatment of hys- teroscopic severe complications [J]. Journal of Practical Obstetrics and Gynecology, 2005, 21(7): 401-403. Chinese.
8SUN XB, LI Y, MEI SY. Hysteroscopy combined with ultra- sonogzaphy in diagnosis and treatment of difficult intrauterine de- vice removal: report of 52 cases [J]. Aerospace Medicine, 2009, 20(2): 112-113. Chinese.
