Supportive Service Information Retrieval
One reminder was automatically sent to all participants in the intervention group during the first month to inform them of the availability of the supportive service information embedded in the platform. Similar to the dose delivered by educational article delivery, dose delivered of supportive service information was presumed to be delivered as planned.The dose received of supportive service information was measured by the number of clicks on the supportive service tab on the WeChat platform. As individual-level data were not available, only the overall number of clicks in each tab was reported.