Received: 2 December 2020
Accepted: 8 April 2021
First Online: 4 May 2021
: As already stated in the methodology section: “The study was carried out in accordance with the Declaration of Helsinki. All ME/CFS participants and HC gave informed, written consent authorizing us to use their medical records for research purposes. The study of the use of clinical data was approved by the medical ethics committee of the Slotervaart Hospital, number P1736, Amsterdam, NL. The testing of HC was approved by the same ethics committee, number P1411”.
: Not applicable.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.