1. Perelman School of Medicine University of Pennsylvania Philadelphia Pennsylvania USA
2. College of Medicine Penn State University Hershey Pennsylvania USA
3. Julius Centre for Health Sciences and Primary Care, University Medical Centre Utrecht Utrecht University Utrecht The Netherlands
4. Department of Obstetrics, Gynecology, and Reproductive Sciences Duquesne University School of Nursing and University of Pittsburgh School of Medicine Pittsburgh Pennsylvania USA
5. Department of Medicine, Brigham and Women's Hospital Harvard Medical School Boston Massachusetts USA