1. Department of Internal Medicine, University General Hospital of Patras, 26504 Patras, Achaia, Greece
2. Medical School of Patras, University of Patras, 26504 Patras, Achaia, Greece
3. Karamandaneio General Hospital of Patras, 26331 Patras, Achaia, Greece
4. Department of Pediatrics, University General Hospital of Patras, 26504 Patras, Achaia, Greece
5. Department of Infectious Diseases, University General Hospital of Patras, 26504 Patras, Achaia, Greece
6. Health Centre of Akrata, 25006 Akrata, Achaia, Greece