1 Division of Gastroenterology, Department of Internal Medicine, Iwate Medical University, Yahaba, Japan; Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
2 Department of Diagnostic Pathology, Iwate Medical University, Yahaba, Japan.
3 Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
4 Division of Gastroenterology, Department of Internal Medicine, Iwate Medical University, Yahaba, Japan; Department of Diagnostic Pathology, Iwate Medical University, Yahaba, Japan.