Funding for this research was provided by:
Miguel Servet I Investigator Award (CP17/00206)
Received: 14 November 2018
Accepted: 7 May 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: The study protocol was approved by the Clinical Research and Ethics Committee of the New Territory West Cluster, Hospital Authority, Hong Kong (Reference No: NTWC/CREC/17044). We confirm that the study was conducted in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare that they have no competing interests.