Am J Med Sci 2013 Nov;346(5):381-4
Departments of Internal Medicine (YU, HS, SI), Gastroenterology Clinics, Pathology (BGD) and Biostatistics (FIK), Zonguldak Karaelmas University Hospital, Zonguldak, Turkey; and Clinics of General Surgery (FAK), Zonguldak State Hospital, Zonguldak, Turkey.