Received: 28 January 2019
Accepted: 30 January 2020
First Online: 6 February 2020
Ethics approval and consent to participate
: The present study was approved by the Bioethics Committee for Research in Jichi Medical University, Japan (reference number: 18–047). It complied with informed voluntariness, and all participants have given their written consent for participation.
: Participants have provided consent for presentation and publication of data.
: The authors declare that they have no competing interests.