Funding for this research was provided by:
Prinses Beatrix Spierfonds (grant number W.OR 14-21)
Received: 21 January 2019
Accepted: 24 September 2019
First Online: 17 October 2019
: The authors declare that they have no competing interests.
: All participants provided written informed consent before inclusion. The study protocol of the PROOF-FO trial was approved by the medical ethics committee of the Academic Medical Center (AMC) in Amsterdam, The Netherlands (register: METC_2014_397).
: Not applicable