Received: 6 April 2020
Accepted: 30 April 2020
First Online: 12 May 2020
Compliance with ethical standards
: AS, SK, and MM are employees of Bristol-Myers Squibb K.K. MH reports postmarketing surveillance study fees from Celgene, Fujifilm RI Pharma, and Shire Japan. KS reports personal fees from Bristol-Myers Squibb K.K., Celgene, Janssen Pharmaceutical, Novartis, Sanofi, and Takeda. YF is supported by Grant-in-Aid for Scientific Research from JSPS, Ministry of Education, Culture, Sports, Science and Technology-supported program for the Strategic Foundation at Private Universities, Japan Leukemia Research Fund, Yasuda Memorial Cancer Foundation, Novartis Foundation, and Takeda Foundation. KO reports honoraria from Bristol-Myers Squibb K.K., Celgene K.K., Janssen Pharmaceutical K.K., Novartis Pharma K.K., Ono Pharmaceutical Co. Ltd, and Takeda Pharmaceutical Co. Ltd.