Document is current

Article History

Received: 15 October 2017

Accepted: 29 May 2018

First Online: 4 June 2018

Ethics approval and consent to participate

: This study was approved by the Nara Medical University Ethics Committee (approval numbers 939 and 991). All study participants provided signed informed consent. If the participant could not give informed consent due to reduced cognitive functioning, physical impairment, and/or severe illness, we asked a relative (normally a spouse or an adult child) to give a proxy consent for the person’s participation, and received written informed consent from a relative.

: The authors declare that they have no competing interests.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.