Nora Mutalima1
, Elizabeth M Molyneux2
, William T Johnston1
, Harold W Jaffe3
, Steve Kamiza4
, Eric Borgstein5
, Nyengo Mkandawire5
, George N Liomba4
, Mkume Batumba6
, Lucy M Carpenter3
and Robert Newton1 
1
Epidemiology and Genetics Unit, Department of Health Sciences, Seebohm Rowntree Building, Area 3, University of York, York YO10 5DD, UK
2
Department of Paediatrics, University of Malawi, College of Medicine, P/Bag 360 Chichiri, Blantyre 3, Malawi
3
Department of Public Health, University of Oxford, Rosemary Rue Building, Old Road Campus, Roosevelt Drive, Headington, Oxford OX3 7LF, UK
4
Department of Histopathology, University of Malawi, College of Medicine, P/Bag 360 Chichiri, Blantyre 3, Malawi
5
Department of Surgery, University of Malawi, College of Medicine, P/Bag 360 Chichiri, Blantyre 3, Malawi
6
Department of Ophthalmology, University of Malawi, College of Medicine, P/Bag 360 Chichiri, Blantyre 3, Malawi