1. Department of Internal Medicine, Nicosia General Hospital, Nicosia 2029, Cyprus
2. 1st Division of Internal Medicine & Infectious Diseases Unit, University General Hospital of Ioannina, Faculty of Medicine, University of Ioannina, Str. Niarchou, 45500 Ioannina, Greece
3. School of Medicine, University of Cyprus, Nicosia 2029, Cyprus
4. Department of Internal Medicine, G. Papanikolaou General Hospital of Thessaloniki, 57010 Thessaloniki, Greece