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David J. Muscatello, Janaki Amin, C. Raina MacIntyre, Anthony T. Newall, William D. Rawlinson, Vitali Sintchenko, Robin Gilmour, Sarah Thackway. "Under-ascertainment of Illness due to Influenza in Administrative Databases, a Population-based Record Linkage Study." Online Journal of Public Health Informatics 6.1 (2014)