Received: 16 May 2019
Accepted: 30 April 2020
First Online: 8 May 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Review Committee, Faculty of Medicine, University of Ruhuna. Informed consent was taken from the patient or next of kin of the patient, and they were invited to participate.
: Not applicable.
: The authors declare that they have no competing interests.