1. San Francisco State University, San Francisco, California, USA
2. Columbia University, New York, New York, USA
3. Johns Hopkins University, Baltimore, Maryland, USA
4. University of Botswana, Gaborone, Botswana
5. University of Pennsylvania, Philadelphia, Pennsylvania, USA
6. Icahn School of Medicine at Mount Sinai, New York, New York, USA
7. NYU School of Global Public Health, New York City, New York, USA