Text and Data Mining valid from 2019-10-22
Received: 11 May 2019
Accepted: 13 September 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: Only secondary data were used so ethics considerations are not applicable. Data was sourced from a PNG Medical Research approved research project (MRAC # 11.41).
: Not applicable.
: The authors declare that they have no competing interests.