Funding for this research was provided by:
National Institutes of Health (NIH R01 HD077108)
National Natural Science Foundation of China (81571510)
Received: 24 September 2018
Accepted: 12 February 2019
First Online: 22 February 2019
Ethics approval and consent to participate
: This study was approved by the Health Sciences Institutional Review Board of the University of Missouri, Columbia, USA and the Medical Ethics Committee of Guangzhou First People’s Hospital, Guangzhou, China. Informed written consent was obtained from each participant prior to participation.
: Not applicable.
: The authors declare that they have no competing interests.
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