1 Department of Population Health, London School of Hygiene and Tropical Medicine, London, UK Suneetha.kadiyala@lshtm.ac.uk.
2 DSI-NRF Centre of Excellence in Human Development, University of the Witwatersrand, Johannesburg, South Africa.
3 Division of Reproductive and Child Health and Nutrition, Indian Council of Medical Research, V Ramalingaswami Bhawan, Ansari Nagar, New Delhi, India.
4 Soils, Food and Healthy Communities, Ekwendeni, Malawi.
5 Department of Population Health, London School of Hygiene and Tropical Medicine, London, UK.