1. Oxford Centre for Clinical Magnetic Resonance Research (OCMR); Division of Cardiovascular Medicine; Radcliffe Department of Medicine; University of Oxford; Oxford United Kingdom
2. Athinoula A. Martinos Center for Biomedical Imaging; Massachusetts General Hospital; Charlestown Massachusetts USA
3. Department of Radiology; Harvard Medical School; Boston Massachusetts USA
4. MRC/UCT Medical Imaging Research Unit; Department of Human Biology; University of Cape Town; South Africa
5. Children's Infectious Diseases Clinical Research Unit; Department of Paediatrics and Child Health; Stellenbosch University and Tygerberg Hospital; Cape Town South Africa