1. University of Washington, Department of Laboratory Medicine, Seattle, WA 98195, USA
2. VA Puget Sound Health Care System, Department of Pathology and Laboratory Medicine, Seattle, WA 98108, USA
3. University of Washington, Department of Otolaryngology: Head and Neck Surgery, Seattle, WA 98195, USA
4. Fred Hutchinson Cancer Research Center, Clinical Research Division, Seattle, WA 98109, USA
5. VA Puget Sound Health Care System, Surgery and Perioperative Care Service, Seattle, WA 98108, USA