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1. Department of Gynecology and Obstetrics, Evangelisches Krankenhaus, Hagen-Haspe Germany, 2. 1st Department of Obstetrics and Gynecology, Medical University of Lódz, Madurowicz Hospital, Poland, 3. 1st Department of Obstetrics and Gynecology, Medical University of Lódz, Madurowicz Hospital, Poland, 4. 1st Department of Obstetrics and Gynecology, Medical University of Lódz, Madurowicz Hospital, Poland, 5. 1st Department of Obstetrics and Gynecology, Medical University of Lódz, Madurowicz Hospital, Poland, 6. Department of Gynecology and Obstetrics, Cantonal Hospital, Frauenfeld Switzerland
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