1. Department of Paediatrics, Patan Academy of Health Sciences , Kathmandu , Nepal
2. Department of Paediatrics, University of Oxford , Oxford , UK
3. Mahidol-Oxford Tropical Medicine Research Unit , Faculty of Tropical Medicine, , Bangkok , Thailand
4. Mahidol University , Faculty of Tropical Medicine, , Bangkok , Thailand
5. Centre for Tropical Medicine and Global Health , Nuffield Department of Medicine, , Oxford , UK
6. University of Oxford , Nuffield Department of Medicine, , Oxford , UK