1. 3rd Clinic of Internal Medicine, Papageorgiou Hospital, Aristotle University of Thessaloniki, 56403 Thessaloniki, Greece
2. Cyprus International Institute for Environmental and Public Health, Cyprus University of Technology, 3041 Limassol, Cyprus
3. MRC Unit for Lifelong Health and Aging, UCL, London WC1E 6BT, UK
4. Menzies Institute for Medical Research, University of Tasmania, Hobart 7000, Australia
5. Medical Signal Analysis, Center for Health & Bioresources, AIT Austrian Institute of Technology GmbH, 1210 Vienna, Austria
6. Department of Functional Sciences-Pathophysiology, Center for Translational Research and Systems Medicine, “Victor Babes” University of Medicine and Pharmacy, 300041 Timisoara, Romania
7. Department of Medicine and Surgery, University of Perugia, Unit of Internal Medicine, Terni University Hospital, 05100 Terni, Italy
8. Cardiology Department, Klinikum Wels-Grieskirchen, 4600 Wels, Austria