1. Department of Obstetrics and Gynecology, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China (mainland)
2. College of Arts and Sciences, Drexel University, Philadelphia, USA, PA
3. Department of Cardiac Surgery, University of Pennsylvania, Philadelphia, USA, PA
4. Department of Anesthesiology and Critical Care, University of Pennsylvania, Philadelphia, USA, PA