Funding for this research was provided by:
Singapore Cancer Society (R-177-000-059-592)
Received: 11 March 2020
Accepted: 20 July 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: This study was performed in accordance with the Declaration of Helsinki and written informed consent was obtained from all study participants prior to study entry. Ethics review and approval was by the National Healthcare Group Domain Specific Review Board Ethics Committee (Reference No. 2017/00029, Received: 25 April 2017).
: The authors declare they have no competing interests.