2.1. Study design
unintentional injuries
The study was conducted in the central area of Jiading District, Shanghai, China, from March 2019 to December 2020, and featured three phases (The phases of study design.Phase 1 comprised a 12-week (~3 months) health-education intervention designed to improve parents' knowledge, skills, and behaviors regarding unintentional injuries among children. The Phase 1 process was conducted by the assistant to the community childcare doctor, who posted 2–3 articles per week on the official WeChat account and also sent the articles to the intervention groups (also Phase 2 comprised the 9 months following Phase 1, during which parents could continue to communicate with each other and ask the community childcare doctor questions about childcare. The difference between the intervention and control group during this phase was that the community childcare doctor was not required to answer the control-group questions within 48 h.Phase 3 comprised an additional follow-up, which lasted 10 months; this represented the post-intervention period, and provided an indication of the group members' voluntary behaviors regarding seeking and providing information concerning unintentional injuries among children. Parents could freely communicate with the other members, and the community childcare doctor was not required to answer any questions unless she wished to do so.This study was approved (IRB No. 2018-01-0663) by the Medical Research Ethics Committee, School of Public Health, Fudan University and registered at Chinese Clinical Trial Registry on 17 January, 2019. All participants provided informed consent prior to participation.