[1] Univ Kansas, Med Ctr, Dept OB GYN, Kansas City, KS 66212 USA
[2] Catholic Univ Louvain, Dept OB GYN, B-1200 Brussels, Belgium
[3] Inst Univ Dexeus, Dept OB GYN, Barcelona, Spain
[4] Inst Univ IVI, Dept OB GYN, Valencia, Spain
[5] Yale Univ, Dept OB GYN, New Haven, CT 06511 USA
[6] Weill Cornell Med Coll, Dept OB GYN, New York, NY 10021 USA
[7] Reprod Biol Associates, Atlanta, GA 30342 USA
[8] Cleveland Clin, Dept OB GYN, Cleveland, OH 44195 USA
[9] Copenhagen Univ Hosp, Dept OB GYN, Copenhagen, Denmark
[10] Karolinska Inst, Dept OB GYN, Stockholm, Sweden
[11] Royal Hosp Sick Children, Edinburgh EH9 1LF, Midlothian, Scotland
[12] Chaim Sheba Med Ctr, Dept OB GYN, IL-52621 Tel Hashomer, Israel
[13] Royal Womens Hosp, Reprod Serv, Parkville, Vic, Australia
[14] Seoul Natl Univ, Dept OB GYN, Seoul, South Korea
[15] Taipei Med Univ Hosp, Dept OB GYN, Taipei, Taiwan
[16] St Marianna Univ, Sch Med, Dept OB GYN, Kawasaki, Kanagawa, Japan