1. Wilmer Eye Institute, Johns Hopkins University School of Medicine, 600 N Wolfe St, Baltimore, MD, USA
2. Center for Surgery and Public Health, Brigham and Women’s Hospital, 1620 Tremont St, Boston, MA, USA
3. Department of Medicine, Johns Hopkins University School of Medicine, 600 N Wolfe St, Baltimore, MD, USA
4. Department of Surgery, Johns Hopkins University School of Medicine, 600 N Wolfe St, Baltimore, MD, USA
5. Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, 615 N Wolfe St, Baltimore, MD, USA
6. Department of Surgery, University of Virginia School of Medicine, 1215 Lee St, Charlottesville, VA, USA
7. Sri Ramachandra University, No. 1, Ramachandra Nagar, Chennai, Tamil Nadu, India
8. Departments of Research Development and Medical Education, Kathmandu University, Dhulikhel, Nepal