Received: 14 April 2020
Accepted: 14 May 2020
First Online: 21 May 2020
Ethics approval and consent to participate
: Ethics approval was obtained from the institutional review board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster (UW 15–102) and written informed consent was obtained.
: There are no financial or non-financial competing interests. JPYC is an associate editor of BMC Musculoskeletal Disorders.