1. Division of Cardiology, Department of Medicine, Mount Sinai Hospital, New York, NY, USA
2. Cardiology Clinic, Cardiology Unlimited PC, New York, NY, USA
3. Department of Medicine, General Clinic of Piraeus “Hippocrates”, Piraeus, Greece
4. Division of Cardiology, Department of Medicine, Montefiore Medical Center, Bronx, NY, USA