1. Department of Genetics, Stanford University School of Medicine, Stanford, CA 94305, USA.
2. Biomedical Informatics Training Program, Stanford University School of Medicine, Stanford, CA 94305, USA.
3. Division of Immunology and Rheumatology, Department of Medicine, Stanford University, Stanford, CA 94305, USA.
4. Department of Medicine, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA 94306, USA.
5. Program in Epithelial Biology and the Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA 94305, USA.