1. aDepartment of Public Health, University of Oxford, Old Road, Oxford, OX3 7LF, England.
2. bMadras Diabetes Research Foundation and Dr Mohan’s Diabetes Specialties Centre, WHO Collaborating Centre for Noncommunicable Diseases Prevention and Control, Gopalapuram, Chennai, India.
3. cDepartment of Community Medicine, University of Colombo, Colombo, Sri Lanka.