1. Departments of Medicine, University of Chicago, Chicago, Illinois 60637;
2. Centre for Immune Regulation, Institute of Immunology, University of Oslo and Oslo University Hospital–Rikshospitalet, N-0372 Oslo, Norway
3. Departments of Human Genetics, University of Chicago, Chicago, Illinois 60637;
4. Departments of Pathology, University of Chicago, Chicago, Illinois 60637;
5. Departments of Pediatrics, University of Chicago, Chicago, Illinois 60637;,