1. Palo Alto Veterans Affairs, Biomedical Informatics Research, Stanford University, 1265 Welch Road; Stanford CA 94305
2. Department of Radiology; Interventional Radiology Section, University of Washington Medical Center, 1959 NE Pacific Street; Seattle WA 98195 USA
3. Biomedical and Health Informatics, Linguistics; University of Washington, Box 358047; Seattle WA 98195 USA