1. 2nd Propedeutic Department of Internal Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
2. 2nd Department of Internal Medicine, "Agioi Anargyroi" Hospital, Attiki, Greece
3. Women's Health Research Unit, Queen Mary University of London, London, United Kingdom
4. Cardiology Department, KAT General Hospital, Athens, Greece
5. Veterans Affairs Medical Center, George Washington University, Washington, DC, United States
6. Cardiology Department, Emory University, Atlanta, GA, United States