Received: 30 May 2019
Accepted: 16 September 2019
First Online: 11 October 2019
Ethics approval and consent to participate
: This study is conducted following the Declaration of Helsinki and Ethical Guidelines for Medical and Health Research Involving Human Subjects and has been approved by the Institutional Review Boards of each participating institute and the Research Ethics Committee of Kawasaki Medical School and Hospital (Additional file InternalRef removed). All patients provided written informed consent before enrollment.
: Not applicable.
: The authors declare that they have no competing interests.