Text and Data Mining valid from 2018-12-18
Received: 23 August 2018
Accepted: 11 December 2018
First Online: 18 December 2018
Compliance with ethical standards
: One of the authors (H.S.) received a research grant from DAIICHI SANKYO COMPANY, LIMITED, Fuji Pharma Co., Ltd., FUJIFILM RI Pharma Co., Ltd., Eisai Co., Ltd. All the other authors have nothing to disclose.