1. Blood Systems Research Institute; University of California San Francisco; San Francisco California
2. Institute for Human Genetics; University of California San Francisco; San Francisco California
3. Department of Laboratory Medicine; University of California San Francisco; San Francisco California
4. RTI; Atlanta Georgia
5. Lifesource; Rosemont Illinois
6. Division of Epidemiology, School of Public Health; University of California Berkeley; Berkeley California
7. Rosalind Russell/Ephraim P. Engleman Rheumatology Research Center, Department of Medicine; University of California San Francisco; San Francisco California
8. Department of Pathology; University of Pittsburgh; Pittsburgh Pennsylvania