1. The Wright Center for Graduate Medical Education, Scranton, PA, USA
2. The Johns Hopkins University, Bloomberg School of Public Health, Baltimore, MD, USA
3. Temple University School of Medicine, Philadelphia, PA, USA
4. Allen Foster Research Centre for Community Eye Health, International Centre for Advancement of Rural Eye Care, L V Prasad Eye Institute, Hyderabad, India
5. Department of Medicine, The Commonwealth Medical College, Scranton, PA, USA