1. Aetion New York New York USA
2. Department of Epidemiology, Mailman School of Public Health Columbia University New York New York USA
3. Harvard Medical School Brigham and Women's Hospital Boston Massachusetts USA
4. Jacobs School of Medicine & Biological Sciences University at Buffalo Buffalo New York USA
5. Population Health Sciences, School of Medicine Duke University Durham North Carolina USA
6. GSK London UK
7. London School of Hygiene and Tropical Medicine University of London London UK
8. New York University New York New York USA