Funding for this research was provided by:
All Japan Labor Welfare Foundation
Received: 15 October 2019
Accepted: 22 December 2020
First Online: 14 January 2021
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of the University of Amsterdam and registered on Clinical Trials Register (clinicaltrials.gov; NCT01517503). All participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.