Article History
Received: 8 January 2020
Accepted: 23 March 2020
First Online: 11 July 2020
Ethics approval and consent to participate
: The use of animals was approved by the Committee on Use of Live Animals in Teaching and Research, the University of Hong Kong (Approval no. 3534–4, 4100–16, and 3573–15).
: Not applicable.
: The authors declare that they have no competing interests.