1. Department of Cardiovascular Medicine, Cleveland Clinic Foundation, Heart and Vascular Institute , 9500 Euclid Avenue, J2-3, Cleveland, OH 44195, USA
2. Gillings School of Global Public Health, the University of North Carolina at Chapel Hill , Chapel Hill, NC 27599, USA
3. Department of Cardiology, Medstar Heart and Vascular Institute , Fairfax, VA 22031, USA