Received: 3 December 2021
Accepted: 3 May 2022
First Online: 9 May 2022
: The study was conducted according to the guidelines of the Declaration of Helsinki. It was approved by the SingHealth Centralized Institutional Review Board (2010/724/A) and the National Health Group Domain Specific Review Board (A/10/690). Patients and caregivers were asked for written informed consent after the study’s procedure was explained.
: Not applicable.
: The authors declare no competing interests.