Funding for this research was provided by:
Zhejiang Yong Ning Pharmaceutical Ltd Co
College of Medical and Dental Sciences, University of Birmingham
Received: 8 December 2020
Accepted: 10 August 2021
First Online: 26 August 2021
: The study was funded through a philanthropic donation from Zhejiang Yong Ning Pharmaceutical Ltd Company (trial registration number: ISRCTN11867516) from 2014 to 2018. Full ethics approvals were obtained from the Life and Health Sciences Ethical Review Committee at the University of Birmingham (2nd March, 2015) and the Ethical Committee of Guangzhou Centre for Disease Control and Prevention (1st December, 2014). Informed consent was sought for each child participant from their parents/guardians.
: Not applicable.
: The authors declare that they have no competing interests.