University of Pennsylvania, University of Pennsylvania, University of Botswana, University of Botswana, Government of the United States of America - Centers for Disease Control and Prevention (CDC), Government of the United States of America - Centers for Disease Control and Prevention (CDC), University of Pennsylvania, University of Pennsylvania, University of Pennsylvania, University of North Carolina (UNC) at Chapel Hill, University of Pennsylvania, University of Toronto, University of Pennsylvania, University of Pennsylvania, University of Pennsylvania, University of Pennsylvania, University of Botswana and University of Pennsylvania