Funding for this research was provided by:
Indonesia Endowment Fund for Education (20151022084537)
Text and Data Mining valid from 2019-07-08
Received: 25 April 2019
Accepted: 3 July 2019
First Online: 8 July 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of the Medical Health Research Ethics Committee, Gadjah Mada University, Indonesia (KE/FK/927/EC) and the Research Ethics Committee of the London School of Hygiene and Tropical Medicine (11944). Written informed consent was obtained from all participants in this study.
: Not applicable.
: The authors declare that they have no competing interests.