Soichi Ohta1, Yuho Najima2, Jun Imamura3. 1. Division of Haematology, Tokyo Metropolitan Cancer and Infectious Disease Centre, Komagome Hospital, Tokyo, Japan. 2. Division of Haematology, Tokyo Metropolitan Cancer and Infectious Disease Centre, Komagome Hospital, Tokyo, Japan. yuhonajima@gmail.com. 3. Division of Hepatology, Tokyo Metropolitan Cancer and Infectious Disease Centre, Komagome Hospital, Tokyo, Japan.