1. Department of Pathology, Walter Reed National Military Medical Center, 8901 Rockville Pike, Bethesda, MD 20889, USA
2. Departments of Pulmonary and Critical Care Medicine, University of Washington, 1959 NE Pacific St, Seattle, WA 98105, USA
3. Department of Laboratory Medicine, University of Washington, 1959 NE Pacific St, Seattle, WA 98105, USA
4. Department of Radiology, Swedish Medical Center, 5300 Tallman Ave NW, Seattle, WA 98107, USA
5. Fred Hutchinson Cancer Research Center, 1100 Fairview ave N, Mailstop G7-910, Seattle, WA 98109, USA
6. Department of Anatomic Pathology, University of Washington, 1959 NE Pacific St, Seattle, WA 98105, USA