1 National Institute of Arthritis and Musculoskeletal and Skin Diseases, NIH, Bethesda, Maryland.
2 Division of Rheumatology, Department of Medicine, and Center for Human Genetics and Genomics, New York University Grossman School of Medicine, New York, and the National Human Genome Research Institute, NIH, Bethesda, Maryland.
3 Division of Immunology, Boston Children's Hospital, and the Division of Rheumatology, Inflammation, and Immunity, Brigham and Women's Hospital, Boston, Massachusetts.
4 National Human Genome Research Institute, NIH, Bethesda, Maryland.