Article History
First Online: 31 January 2019
Competing interests
: Y.T. has received honoraria and grants from Bristol-Myers Squibb, Novartis, Ono, Taiho and Takeda, a grant from AstraZeneca and honoraria from Boehringer Ingelheim. K.S. has received advisory fees and grants from Astellas, Lilly and Ono, grants from Chugai, Daiichi Sankyo, Dainippon Sumitomo, Merck Sharp & Dohme and Taiho and advisory fees from Bristol-Myers Squibb, Pfizer and Takeda. H.N. has received honoraria and grants from Bristol-Myers Squibb, Chugai and Ono and grants from Astellas, BD Japan, Daiichi Sankyo, Kyowa Hakko Kirin, Sysmex, Taiho and Zenyaku Kogyo.