1. Division of Headache Medicine, Department of Neurology, University of California, San Francisco, San Francisco, California, USA.
2. Department of Ophthalmology, University of California, San Francisco, San Francisco, California, USA.
3. Quantitative Sciences Unit, Biomedical Informatics Research Division in the Department of Medicine, Stanford Medicine, Stanford, California, USA.
4. Facente Consulting, Richmond, California, USA.
5. Division of Plastic and Reconstructive Surgery, Department of Surgery, Stanford Medicine, Stanford, California, USA.