1. Department of Hygiene and Epidemiology, University of Ioannina Medical School (A.G., E.E.).
2. Clinical Therapeutics, National & Kapodistrian University of Athens School of Medicine, Athens, Greece (G.G., D.D., E.M., O.N.).
3. School of Biomedical Engineering and Imaging Sciences, Kings College London, United Kingdom (G.G., P.G.M.).
4. Athens Medical Center, Greece (D.T.).
5. Department of Epidemiology & Biostatistics, School of Public Health, Imperial College London, United Kingdom (E.E.).