Article History
Received: 3 August 2019
Accepted: 3 March 2020
First Online: 12 March 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the local ethics committee of Preah Ket Mealea Hospital. Because this was an observational quality improvement study, the need for individual written consent was waived by the hospital ethics committee.
: Not applicable.
: The authors declare that there have no competing interests.