Funding for this research was provided by:
Prinses Beatrix Spierfonds (W.OR 14-21)
Received: 15 December 2020
Accepted: 31 May 2021
First Online: 8 June 2021
: All participants provided written informed consent before inclusion. The study protocol of the PROOF-AFO trial was approved by the medical ethics committee of the Academic Medical Center (AMC) in Amsterdam, The Netherlands (register: METC_2014_397).
: Not applicable.
: The authors declare that they have no competing interest.