Funding for this research was provided by:
Received: 26 May 2019
Accepted: 24 October 2019
First Online: 27 November 2019
Ethics approval and consent to participate
: Ethical approval for this study (No. 21003) was provided by the Ethics Committee of Fukushima Medical University, and written informed consent was obtained from each individual.
: Not applicable
: KM has received research grants from Chugai, Pfizer, and AbbVie. The rest of the authors declare that they have no competing interests.