1. Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University , Fukuoka , Japan
2. Neuroendocrine Tumor Centre, Fukuoka Sanno Hospital , Fukuoka , Japan
3. Department of Gastroenterology , Graduate School of Medical Sciences, , Fukuoka , Japan
4. International University of Health and Welfare , Graduate School of Medical Sciences, , Fukuoka , Japan
5. Department of Clinical Radiology , Graduate School of Medical Sciences, , Fukuoka , Japan
6. Kyushu University , Graduate School of Medical Sciences, , Fukuoka , Japan