Patient retention and attrition on antiretroviral treatment at district level in rural Malawi
a Médecins Sans Frontières, Thyolo District, Thyolo, Malawi b Médecins Sans Frontières, Medical Department (Operational Research), Brussels Operational Center, Brussels, Belgium c Ministry of Health and Population, Thyolo District Health Services, Thyolo, Malawi d District Health Services, Ministry of Health and Population, Thyolo, Malawi e International Union against Tuberculosis and Lung Disease, Paris, France f London School of Hygiene and Tropical Medicine, London, UK