Randomization and Masking
A multistage random sampling method was performed, and random selections were generated by using random.org (Randomness and Integrity Services Ltd). Eight villages (Guilin, Jianzheng, Qianfeng, Yixue, Xinsheng, Yijia, Huanglian, and Tiane), which have a minimum of 4 km of distance between them, were randomly selected from Sichuan, China. The 8 villages were further randomly assigned to the intervention (n = 4) or the control group (n = 4). A single-blind process was pursued. Participants and assessment team were blinded to the group assignment. Participants were asked not to discuss the intervention during the assessment.