1. Department of Obstetrics and Gynecology, Kaiser Permanente Southern California, 1200 Discovery Drive, Bakersfield, Kern County, CA 93309, USA
2. School of Medicine, St. George’s University, St. George’s, Grenada
3. Department of Anesthesiology, Adventist Health Bakersfield, 2615 Chester Avenue, Bakersfield, CA 93301, USA
4. Department of Obstetrics and Gynecology, Lincoln Medical and Mental Health Center, 234 East 149th Street, Bronx, NY 10451, USA