Funding for this research was provided by:
Research Grant Council, Hong Kong (HKU-774309M)
Received: 16 December 2018
Accepted: 10 July 2019
First Online: 19 July 2019
Ethics approval and consent to participate
: The study was approved by Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster (HKU/HA HKW IRB) and written informed consents were obtained from patients prior to their inclusion.
: Not applicable.
: The authors declare that they have no competing interests.