Funding for this research was provided by:
Swiss Medical Board
Bundesamt für Gesundheit
Received: 13 July 2020
Accepted: 18 December 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: As a systematic review and meta-analysis based on aggregate-level data from published RCTs, this study does not require ethics approval under the Swiss Human Research Act.
: Not applicable.
: The authors declare that they have no competing interests.