1 Department of Internal Medicine, Faculty of Medicine, School of Health Sciences, University of Ioannina, Ioannina, Greece.
2 1st Propaedeutic Department of Medicine, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. Electronic address: elibero@med.uoa.gr.
3 College of Medicine, Mohammed Bin Rashid University, Dubai, United Arab Emirates; Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (Promise), School of Medicine, University of Palermo, Palermo, Italy.