Randomisation
POLAND
Dyads were randomly allocated to one of the three intervention groups with a 1:1:1 allocation using a computer-generated schedule of randomly permuted blocks, stratified by site (Queensland [Australia], Victoria [Australia], Germany, Norway, Poland and the UK) to achieve a balance between the arms within each stratum. The list was created by an independent statistician and uploaded to the randomisation module of the REDCap (Research Electronic Data Capture) trial database hosted at the University of Melbourne [