1. Introduction to SAS,2011
2. FluView: a weekly influenza surveillance report prepared by the influenza division;Centers for Disease Control and Prevention,2010
3. Update: influenza activity—United States, 2009-2010 season;Centers for Disease Control and Prevention;MMWR Morb. Mortal. Wkly. Rep.,2010
4. Update: influenza activity—United States, 2010-2011 season, and composition of the 2011-2012 influenza vaccine;Centers for Disease Control and Prevention;MMWR Morb. Mortal. Wkly. Rep.,2011