I started my career as a doctor in 2008 Japan. I have finished 2 years of residency, and I became a gastroenterologist. After 3 years of experience of general gastroenterology, I joined the residency program of National Cancer Center Hospital (NCCH) to specialize in endoscopy. I have spent 5 years there. After finishing the program in NCCH, I became a staff of Showa university hospital.