Received: 20 May 2019
Accepted: 26 July 2019
First Online: 31 July 2019
Ethics approval and consent to participate
: The study protocol of using human peripheral blood mononuclear cells isolated from buffy coat was approved by the Joint Chinese University of Hong Kong–New Territories East Cluster Clinical Research Ethics Committee (CREC Ref. No.: 2015.266).
: Not applicable.
: The authors declare that they have no competing interests.