1. Tekirdag State Hospital, Department of Gastroenterohepatology, Tekirdag, Turkey;
2. Tekirdag State Hospital, Department of Neurology, Tekirdag, Turkey;
3. Haseki Training and Research Hospital, Department of Gastroenterohepatology, Istanbul, Turkey;
4. Koç University Hospital, Department of Gastroenterohepatology, Istanbul, Turkey