1. Head of Population Health and Demography Unit, Papua New Guinea Institute of Medical Research, PO Box 60, Goroka EHP 441, Papua New Guinea. Correspondence: ,
2. Dean of College of Public Health, Medical and Veterinary Sciences, James Cook University, Townsville, Australia
3. Senior Professor, Early Start Research Institute and Illawarra Healthy and Medical Research Institute, University of Wollongong, Wollongong, NSW, Australia
4. Director, Papua New Guinea Institute of Medical Research, Goroka, Papua New Guinea