Estimating the date of hepatitis C virus (HCV) infection among Alaska native blood transfusion recipients and intravenous drug users (IDU): comparison between data from patient interviews and antibody tests using stored sera: Dana Bruden, Arctic Investigations Program, Centers for Disease Control and Prevention, Achorage, AK; Brian McMahon, Alaska Native Medical Ctr, Anchorage, AK; Thomas Hennessey, Arctic Investigations Program, Anchorage, AK; Carol Christensen, Chriss Homan James Williams, Alaska Native Medical Ctr, Anchorage, AK; Dan Sullivan, David R Gretch, University of Washington, Seattle, WA