References
- Farghaly S A, Mathie J G. Retained Gräfenberg ring for 39 years discovered during abdominal hysterectomy. Aust NZ Obstet Gynaecol 1980; 20: 248–250
- Thiery M. Pioneers of the intrauterine device. Eur J Contracept Reprod Health Care 1997; 2: 15–23
- Jin E Q. Study of IUD side effects indicated in hysteroscopic and pathological examinations. Shengzhi Yu Biyun 1991; 11: 69–71
- Xiao B, Wang M. Birth control techniques in China. China Popul Newsl 1983; 1: 1–7
- Anonymous. China changes from the stainless steel ring to modern IUDs. Prog Hum Reprod Res 1993; 27: 7
- Tatum H J. Intrauterine contraception. Obstetrics and Gynaecology Annual, R M Wynn. Appleton-Century-Crofts, New York 1973; 2: 307
- New F C, Candelier C K. A case of hysterotomy for removal of intrauterine contraceptive device and subsequent pregnancy. J Fam Plann Reprod Health Care 2004; 30: 177–178
- Lehfeldt H. Ernst Gräfenberg and his ring. Mt Sinai J Med 1975; 42: 345–352
- Inal M M, Ertopcu K, Ozelmas. The evaluation of 318 intrauterine pregnancy cases with an intrauterine device. Eur J Contracept Reprod Health Care 2005; 10: 266–271