2 Centre for Infectious Disease Research in Zambia, Lusaka, Zambia.
3 Division of HIV, Infectious Diseases and Global Medicine, Zuckerberg San Francisco General Hospital and Trauma Center, Department of Medicine, University of California, San Francisco, CA, USA.
4 FIND, 1202 Geneva, Switzerland; Division of Tropical Medicine, Center of Infectious Diseases, University of Heidelberg, Heidelberg, Germany.