[1] Landeskrankenhaus Bregenz, Dept Obstet & Gynaecol, A-6900 Bregenz, Austria
[2] Landeskrankenhaus Bludenz, Dept Obstet & Gynaecol, Bludenz, Austria
[3] Private Clin, Innsbruck, Austria
[4] Private Clin, Graz, Austria
[5] Private Clin, Linz, Austria
[6] Private Clin, Vienna, Austria
[7] Private Clin, St Polten, Austria
[8] Private Clin, Salzburg, Austria
[9] Private Clin, Klagenfurt, Austria
[10] Kaiser Franz Josef Spital, Dept Obstet & Gynaecol, Vienna, Austria
[11] Univ Clin Gynaecol, Clin Endocrinol & Reprod, Innsbruck, Austria