1. School of Economics; University of New South Wales; Australia
2. CHERE; University of Technology Sydney; Australia
3. National Centre for Immunisation Research and Surveillance; The Children's Hospital Westmead; Australia
4. School of Mathematical Sciences; University of Technology Sydney; Australia
5. Department of Economics; University of Sheffield; UK
6. Family Planning NSW; Australia
7. Department of Obstetrics, Gynaecology and Neonatology; University of Sydney; Australia