Identification and Epidemiology of Severe Respiratory Disease due to Novel Swine-Origin Influenza A (H1N1) Virus Infection in Alberta oleh George Zahariadis, Ari R Joffe, James Talbot, Albert deVilliers, Patricia Campbell, Kanti Pabbaraju, Sallene Wong, Nathalie Bastien, Yan Li, Robyn L Mitchell, Xiao-Li Pang, Stephanie Yanow, Linda Chui, Gerald Predy, David Willans, Bonita E Lee, Jutta K Preiksaitis, Bev Clement, Angela Jacobs, Joy Jaipaul, Kevin Fonseca