Funding for this research was provided by:
Chinese University of Hong Kong (research accounts 6901031 and 7101215)
Text and Data Mining valid from 2019-03-04
Received: 18 December 2018
Accepted: 25 February 2019
First Online: 4 March 2019
Ethics approval and consent to participate
: This is an observational study approved by the Clinical Research Ethics Committee of the Chinese University of Hong Kong (approval number CRE-2017.0314). All study procedures were in compliance with the Declaration of Helsinki. All patients provided written informed consent to participate in the study.
: Not applicable.
: The authors declare that they have no competing interests.
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