Department of Gynecoloff.cal Endocrinology Beijing Obstetrics and Gynecology Hospital Coital Medical University Yaojiayuan Road 251 Beijing 100026 China;
Department of Gynecoloff.cal Endocrinology Beijing Obstetrics and Gynecology Hospital Coital Medical University Yaojiayuan Road 251 Beijing 100026 ChinaDepartment of Womens HeaZth University Hospital Tuebingen Calwer Strasse 7 Tuebingen 72076 Germany;
Department of Gynecoloff.cal Endocrinology Beijing Obstetrics and Gynecology Hospital Coital Medical University Yaojiayuan Road 251 Beijing 100026 ChinaJohn Rabe Communication Center Krehlstrasse 56 Heidelberg 69120 Gemumy;
Intrauterine contraception; Menstrual bleeding; Treatment;