1. Arizona Perinatal Care Center of Northern Arizona, Flagstaff, AZ, USA
2. The Desert Perinatal Center, Palm Springs, CA, USA
3. Fetal Medicine Foundation of America, New York, NY, USA
4. Department of Obstetrics and Gynecology, Albert Einstein College of Medicine, Bronx, NY, USA
5. Department of Obstetrics & Gynecology, Mt. Sinai School of Medicine, Institute for Genetics, NY, USA