1. Department of Epidemiology, Jonathan and Karin Fielding School of Public Health, University of California Los Angeles, Los Angeles, California;
2. Kinshasa School of Public Health, Kinshasa, Democratic Republic of the Congo;
3. National Institute for Biomedical Research, Kinshasa, Democratic Republic of the Congo;
4. Department of Medicine, Jonathan and Karin Fielding School of Public Health, University of California Los Angeles, Los Angeles, California