1. Department of Gynecology and Obstetrics, Emory University School of Medicine, 80 Jesse Hill Jr. Drive SE, Atlanta, GA 30303, USA
2. Department of Anesthesiology, Sidney Kimmel Medical College at Thomas Jefferson University Hospital, Suite 515, 1020 Walnut Street, Philadelphia, PA 19107, USA
3. Department of Orthopedic Surgery and Medicine, The Perelman School of Medicine, University of Pennsylvania, Penn Musculoskeletal Center, Suite 600, 3737 Market Street, Philadelphia, PA 19104, USA