Funding for this research was provided by:
China Postdoctoral Science Foundation (2019M663619)
National Natural Science Foundation of China (71703084, 71803108)
Higher Education Discipline Innovation Project (B16031)
Fundamental Research Funds for the Central Universities (20SZYB12)
Zhejiang Hupan Modou Foundation
Received: 25 June 2020
Accepted: 29 September 2020
First Online: 12 October 2020
Ethics approval and consent to participate
: All study protocols were approved by institutional review boards (IRBs), both at Stanford University (No. 46564) and the West China School of Medicine, Sichuan University, China (No. K2018074). Caregivers provided written consent for their own participation and the participation of their children after a field worker read the consent form out loud and answered any questions. All study staff were trained and monitored in IRB-approved procedures for identifying participant needs.
: Not applicable. All data used in the study has been anonymized.
: We declare no competing interests.