General approach
Descriptive analyses were utilized to report participants’ demographic and behavioural characteristics in each study arm. Risk differences and corresponding 95% CIs were expressed as percentages instead of the standard decimal form for ease of interpretability. All inferential tests were two-sided with a type 1 error level of 0.05, and analyses were conducted using SAS version 9.4. Details on the sample size calculations and pre-specified analyses can be found in the protocol (Additional file 