1. Indiana University School of Medicine, Department of Ophthalmology, Indianapolis, IN, USA
2. Wills Eye Hospital, Philadelphia, PA, USA
3. Quorum Consulting Inc., San Francisco, CA, USA
4. Sg2 Health Care Intelligence, Skokie, IL, USA and University of California, San Francisco and Los Angeles, Departments of Epidemiology and Biostatistics, Medicine and Health Services, San Francisco and Los Angeles, CA, USA