1. Mayo Clinic College of Medicine and Science, Rochester, MN 55905, USA
2. Department of Hospital Medicine, Mayo Clinic Health System, Eau Claire, WI 54703, USA
3. Institute of Social Medicine, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
4. Centre-School of Public Health and Health Management, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
5. Department of Cardiology, Mayo Clinic Health System, Eau Claire, WI 54703, USA