1. Cyprus International Institute for Environmental and Public Health, Cyprus University of Technology, Limassol, Cyprus
2. MRC Unit for Lifelong Health and Ageing, UCL, London, UK
3. Menzies Institute for Medical Research, University of Tasmania, Hobart, Tasmania, Australia
4. Medical Signal Analysis, Center for Health & Bioresources, AIT Austrian Institute of Technology GmbH, Vienna, Austria
5. Department of Medicine and Surgery, University of Perugia – Unit of Internal Medicine, Santa Maria Terni Hospital, Terni
6. Institute of Clinical Physiology, CNR, Pisa, Italy
7. Cardiology Department, Klinikum Wels-Grieskirchen, Wels, Austria
8. 3rd Clinic of Internal Medicine, Papageorgiou GH, Aristotle University of Thessaloniki, Thessaloniki, Greece