Funding for this research was provided by:
Radboudumc Revolving Research Fund
Text and Data Mining valid from 2019-11-28
Received: 29 May 2019
Accepted: 4 November 2019
First Online: 28 November 2019
Ethics approval and consent to participate
: The research was approved by the Oxford University Tropical Research Ethics Committee (OxTREC, 49–14) and the National Institute of Hygiene and Epidemiology, Vietnam (NIHE) institutional review board. Written informed consent was obtained from all participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.