1. Department of Ophthalmology; California Pacific Medical Center; San Francisco California USA
2. Departments of Ophthalmology and Quality; Kaiser Permanente; Walnut Creek California USA
3. Division of Research; Kaiser Permanente Northern California; Oakland California USA
4. Department of Ophthalmology; Kaiser Permanente; Pasadena California USA
5. Division of Infectious Diseases, Department of Ophthalmology; Oregon Health and Sciences University; Portland Oregon USA