1. Department of Obstetrics and Gynecology (D.F.A.), Contraceptive Research and Development (CONRAD) Clinical Research Center, Eastern Virginia Medical School, Norfolk, Virginia 23507
2. Wayne State University/Hutzel Women’s Hospital (S.H.), Detroit, Michigan 48201
3. Bone Metabolism Section (J.C.G.), Creighton University Medical Center, Omaha, Nebraska 68131
4. Division of Obstetrics and Gynaecology (J.R.), King’s College School of Medicine at Guy’s and St. Thomas’ Hospitals, London SE5 9RT, United Kingdom
5. Department of Obstetrics and Gynecology (S.S.), Frederiksberg University Hospital, 2000 Copenhagen, Denmark
6. McGill and Sir Mortimer B. Davis Jewish General Hospital (A.F.), Montréal, Québec, Canada H3T IE2
7. NV Organon (W.d.H.), 5340 BH Oss, The Netherlands
8. Organon International (V.S., F.A.H.), Roseland, New Jersey 07068