1. 1Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN
2. 2Retham Technologies, Wauwatosa, WI
3. 3Special Coagulation Laboratory, Mayo Clinic, Rochester, MN
4. 4Department of Medicine, Mayo Clinic, Rochester, MN
5. 5Department of Medicine, University of Colorado, Aurora, CO
6. 6Department of Internal Medicine, University of Utah, Salt Lake City, UT
7. 7Department of Pathology, University of Chicago, Chicago, IL
8. 8Department of Internal Medicine, University of Nebraska Medical Center, Omaha, NE