1. Institute for Cardiovascular Diseases “Dedinje,” Belgrade, Serbia (N.O.).
2. Division of Cardiology, Department of Medicine, University of California, Los Angeles (R.V.P.).
3. Department of Internal Medicine, Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT (S.M.S.).
4. Veterans Affairs Connecticut Healthcare System, West Haven, CT (S.M.S.).