1. School of Medicine, University of Papua New Guinea, Port Moresby, Papua New Guinea
2. Papua New Guinea Institute of Medical Research, Goroka, Papua New Guinea
3. School of Pharmacy and Biomedical Sciences, Curtin University, Bentley, Western Australia, Australia
4. Medical School, University of Western Australia, Fremantle Hospital, Fremantle, Western Australia, Australia
5. Medical School, University of Western Australia, Harry Perkins Research Institute, Fiona Stanley Hospital, Murdoch, Western Australia, Australia
6. Department of Medicine, Fremantle Hospital, Fremantle, Western Australia, Australia