Perceptions of influenza immunization systems for collecting pandemic H1N1 immunization data within Canada’s public health community: A qualitative study

Christine L. Heidebrecht, Julie Foisy, Jennifer A. Pereira, Sherman D. Quan, Donald J Willison, Shelley L. Deeks, Michael Finkelstein, Natasha S. Crowcroft, David L. Buckeridge, Maryse Guay, Christopher A Sikora and Jeffrey C. Kwong