Received: 24 September 2019
Revised: 17 January 2020
Accepted: 13 February 2020
First Online: 27 February 2020
Compliance with ethical standards
: The experiments reported here were performed in agreement with the Declaration of Helsinki principles and with the Ethics Committee of the National Defense Medical College Hospital, Tokorozawa, Japan. ES is the guarantor of this work and, as such, had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
: The authors declare that they have no conflict of interest.