[1] Univ Med Ctr Utrecht, Dept Reprod Med & Gynecol, NL-3584 CX Utrecht, Netherlands
[2] Med Sch Thessaloniki, Thessaloniki, Greece
[3] Univ Alabama Birmingham, Birmingham, AL USA
[4] Penn State Coll Med, Hershey, PA USA
[5] Leeds Teaching Hosp, Leeds, W Yorkshire, England
[6] Columbia Univ, New York, NY USA
[7] Univ Palermo, Palermo, Italy
[8] Univ Calif San Diego, San Diego, CA 92103 USA
[9] Hacettepe Univ, Sch Med, Ankara, Turkey
[10] Erasmus Univ, Med Ctr, Rotterdam, Netherlands
[11] Cardiff Univ, Cardiff, S Glam, Wales
[12] Univ Siena, I-53100 Siena, Italy
[13] Univ Colombo, Colombo, Sri Lanka
[14] Univ Adelaide, Robinson Inst, Adelaide, SA, Australia
[15] Northwestern Univ, Chicago, IL 60611 USA
[16] Univ London Imperial Coll Sci Technol & Med, London, England
[17] Univ Oklahoma, Oklahoma City, OK USA
[18] Univ Calif Los Angeles, Los Angeles, CA USA
[19] Univ Penn, Philadelphia, PA 19104 USA