1. School of Social Work, Universitas Islam Negeri Sunan Kalijaga Yogyakarta, Yogyakarta, Indonesia
2. School of Population and Global Health, University of Melbourne, Melbourne, Australia
3. School of Geography, Earth and Atmospheric Sciences, University of Melbourne, Melbourne, Australia
4. School of Demography, The Australian National University, Canberra, Australia
5. MRC/Wits Rural Public Health and Health Transitions Research Unit (Agincourt), School of Public Health, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa