Received: 14 September 2018
Accepted: 8 January 2019
First Online: 23 January 2019
Ethics approval and consent to participate
: Informed consent was obtained from all patients, and the study protocol was approved by the institutional ethics committees of Kurume University School of Medicine (Approval Number; 13,282).
: Not applicable
: KF has received honoraria such as lecture fees from Otsuka Pharmaceutical Co., Ltd. The other authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.