[1] Univ Hosp Bonn, Univ Womens Hosp, Dept Reprod Med & Endocrinol, Bonn, Germany
[2] Univ Hosp Erlangen, Univ Womens Hosp, Dept Reprod Med & Endocrinol, Erlangen, Germany
[3] Univ Heidelberg Hosp, Univ Womens Hosp, Dept Reprod Med & Endocrinol, Heidelberg, Germany
[4] Johanna Etienne Hosp Neuss, Womens Hosp, Neuss, Germany
[5] Univ Hosp Dusseldorf, Univ Womens Hosp, Dept Reprod Med & Endocrinol, Dusseldorf, Germany
[6] Univ Innsbruck Hosp, Univ Womens Hosp, Dept Reprod Med & Endocrinol, A-6020 Innsbruck, Austria
[7] St Joseph Stift Hosp Bremen, Womens Hosp, Bremen, Germany
[8] Caritas Hosp St Josef Regensburg, Womens Hosp, Regensburg, Germany
[9] Univ Hosp Freiburg, Univ Womens Hosp, Dept Reprod Med & Endocrinol, Freiburg, Germany
[10] Univ Hosp Inselspital Bern, Univ Womens Hosp, Dept Reprod Med & Endocrinol, Bern, Switzerland