Received: 2 March 2020
Accepted: 28 April 2020
First Online: 8 June 2020
Ethics approval and consent to participate
: Ethical approval for this study was obtained from the regional ethics review boards in Gothenburg and Stockholm.
: Not applicable.
: The authors declare that they have no potential conflicts of interest. The original datasets of the included randomised control trials can be accessed by contacting the corresponding author.