1. Department of Internal Medicine; Bürgerspital Hospital; Solothurn Switzerland
2. Department of Internal Medicine; Agios Pavlos General Hospital; Thessaloniki Macedonia Greece
3. Department of Internal Medicine; Ippokration Hospital; Second Medical Clinic; Aristotle University of Thessaloniki; Thessaloniki Macedonia Greece
4. Department of Pediatrics; Papageorgiou General Hospital; Aristotle University of Thessaloniki; Thessaloniki Macedonia Greece
5. Department of Neurology; Papageorgiou General Hospital; Multiple Sclerosis Unit; Aristotle University of Thessaloniki; Thessaloniki Macedonia Greece