Received: 27 June 2017
Accepted: 22 January 2018
First Online: 2 February 2018
Ethics approval and consent to participate
: This study was performed in accordance with the Declaration of Helsinki and have been approved by the Joint CUHK-NTEC Clinical Research Ethics Committee of the Chinese University of Hong Kong (Clinical trial registry: CREC Ref. No.:2015.348). Retrospectively registered onExternalRef removed- NCT03404765.Written informed consent were signed by all participants before joining the study.
: Not Applicable. The manuscript does not contain any individual person’s data.
: The authors declare that they have no competing interest in this work.
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