Received: 16 September 2019
Accepted: 5 November 2020
First Online: 18 November 2020
Ethics approval and consent to participate
: The study protocol was approved by the medical ethics committee of the University Hospitals Leuven (SR12/2014, version 2, 4th May 2015) and by the Federal Agency for Medicines and Health Products, Brussels, Belgium (16th, April 2015). All patients gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests. Koen Milisen is senior editor for BMC Geriatrics.