1. School of Medicine; University of Ioannina; Ioannina Greece
2. Second Propedeutic Department of Internal Medicine, Medical School; Aristotle University of Thessaloniki, Hippocration Hospital; Thessaloniki Greece
3. Institute of Psychological Sciences, Faculty of Medicine and Health; University of Leeds; Leeds UK
4. Metabolic Research Laboratory; Clinica Universidad de Navarra, CIBEROBN; Pamplona Spain