1 Division of Infectious Diseases and Global Public Health, Department of Medicine, University of California San Diego School of Medicine, San Diego, California, United States of America.
2 Fielding School of Public Health, University of California-Los Angeles, Los Angeles, California, United States of America.
3 Institut National de Recherche Biomédicale (INRB), Kinshasa, Democratic Republic of Congo.
4 University of Kinshasa, Kinshasa, Democratic Republic of Congo.