Article History
Received: 20 June 2019
Accepted: 21 August 2019
First Online: 27 August 2019
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the Medical and Health Research Ethics Committee of the Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Yogyakarta, Indonesia. Written informed consents were obtained from all informants prior to interview.
: Not applicable.
: The authors declare that they have no competing interests.