1. Department of Obstetrics and Gynecology Los Angeles California
2. Department of Orthopaedic Surgery Los Angeles California USA
3. Department of Human Genetics Los Angeles California USA
4. Department of Obstetrics and GynecologyColumbia University Medical Center New York New York USA
5. David Geffen School of Medicine at the University of California Los Angeles Los Angeles California USA
6. Center for Fetal Medicine and Women's Ultrasound Los Angeles California USA