[1] Tech Univ Munich, Frauenklin & Poliklin, D-81675 Munich, Germany
[2] Univ Frauenklin, Inselspital, Abt Gynakol Endokrinol & Reprod Med, Bern, Switzerland
[3] Univ Heidelberg, Abt Gynakol Endokrinol & Fertilitatsstorungen, D-6900 Heidelberg, Germany