1. Laboratory of Hygiene, Social-Preventive Medicine and Medical Statistics, Faculty of Medicine, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
2. Division of Technology and Sciences, The American College of Thessaloniki, 55535 Thessaloniki, Greece
3. Independent Researcher, Bristol BS15LN, UK
4. Faculty of Health and Rehabilitation Sciences, University of East London, Metropolitan College of Thessaloniki, 54624 Thessaloniki, Greece