1. Division of Cardiology, Department of Medicine University of Pittsburgh Medical Center Pittsburgh PA USA
2. Lifespan Cardiovascular Institute, Warren Alpert Medical School of Brown University Providence RI USA
3. Department of Obstetrics, Gynecology, and Reproductive Sciences University of Pittsburgh Pittsburgh PA USA
4. Department of Family and Community Medicine University of Maryland Baltimore MD USA
5. Center for Research on Health Care University of Pittsburgh School of Medicine Pittsburgh PA USA