1 ASRI Clinic, Sukadana, West Kalimantan, Borneo; Hull York Medical School, University of York, Heslington YO10 5DD, UK. Electronic address: sarah.walpole@hyms.ac.uk.
2 School of Development, Azim Premji University, Bangalore, India.
3 Devon, UK.
4 Environmental Health Department, School of Public Health and Family Medicine, University of Cape Town, Cape Town, South Africa.