Received: 28 November 2019
Accepted: 6 April 2020
First Online: 17 April 2020
Ethics approval and consent to participate
: This study was reviewed and approved by the Committee of the Medical Research Ethics of the Faculty of Medicine Universitas Indonesia. Ethical aspect of research was followed very strictly and written informed consent was obtained prior to study enrolment. Confidentiality of the subjects was maintained to ensure privacy of their data. Codes were used to anonymize the identity of subjects.
: Not applicable.
: The authors declare that they have no competing interests.