TY - JOUR A1 - Ombelet, Willem A1 - Martens, Guy A1 - De Sutter, Petra A1 - Gerris, Jan A1 - Bosmans, Eugene A1 - Ruyssinck, Gunther A1 - Defoort, Paul A1 - Molenberghs, Geert A1 - Gyselaers, Wilfried T1 - Perinatal outcome of 12 021 singleton and 3108 twin births after non-IVF-assisted reproduction: a cohort study Y1 - 2006 DO - 10.1093/humrep/dei419 JF - Human Reproduction VL - 21 IS - 4 SP - 1025 EP - -1032 ER -