Funding for this research was provided by:
National Institutes of Health (K08AA025112)
Received: 27 April 2019
Accepted: 31 July 2019
First Online: 8 August 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board, The University of Hong Kong (UW 17–312). Written informed consent was obtained from all the patients.
: Not applicable.
: The authors declare that they have no conflicts of interest.