1. Department of Obstetrics and Gynecology, College of Medicine and Dentistry of New Jersey; New Jersey Medical School; Newark New Jersey USA
2. Department of Preventive Medicine, College of Medicine and Dentistry of New Jersey; New Jersey Medical School; Newark New Jersey USA
3. Huize Maria Roepaan Institute for Observation and Treatment of the Mentally Retarded; Ottersum The Netherlands
4. Department of Obstetrics and Gynecology; The State University of New York, Upstate Medical Center; Buffalo New York USA
5. Department of Obstetrics and Gynecology; University of Southern California School of Medicine; Los Angeles California USA