1. Institute of Medical Science, University of Toronto, Toronto, Ontario M5S 1A8, Canada.
2. Sandra A. Rotman Laboratories, Sandra Rotman Centre for Global Health, University Health Network-Toronto General Hospital, University of Toronto, Toronto, Ontario M5G 1L7, Canada.
3. Mouse Imaging Centre, Hospital for Sick Children, Toronto, Ontario M5T 3HT, Canada.
4. Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 1L7, Canada.
5. Howard Hughes Medical Institute, Department of Neurobiology, Harvard Medical School, Boston, MA 02138, USA.
6. College of Medicine, University of Malawi, P.O. Box 280, Blantyre, Malawi.
7. Liverpool School of Tropical Medicine, Liverpool L35QA, UK.
8. Tropical Disease Unit, Division of Infectious Diseases, Department of Medicine, University of Toronto, Toronto, Ontario M5G 2C4, Canada.