Using physician billing claims from the Ontario Health Insurance Plan to determine individual influenza vaccination status: an updated validation study

Institute for Clinical Evaluative Sciences (Schwartz, Jembere, Campitelli, Chung, Kwong); Institute of Health, Policy, Management, and Evaluation (Schwartz), University of Toronto; Dalla Lana School of Public Health (Buchan, Kwong), University of Toronto; Public Health Ontario (Kwong), Toronto Ont.

Institute for Clinical Evaluative Sciences (Schwartz, Jembere, Campitelli, Chung, Kwong); Institute of Health, Policy, Management, and Evaluation (Schwartz), University of Toronto; Dalla Lana School of Public Health (Buchan, Kwong), University of Toronto; Public Health Ontario (Kwong), Toronto Ont.

Institute for Clinical Evaluative Sciences (Schwartz, Jembere, Campitelli, Chung, Kwong); Institute of Health, Policy, Management, and Evaluation (Schwartz), University of Toronto; Dalla Lana School of Public Health (Buchan, Kwong), University of Toronto; Public Health Ontario (Kwong), Toronto Ont.

Institute for Clinical Evaluative Sciences (Schwartz, Jembere, Campitelli, Chung, Kwong); Institute of Health, Policy, Management, and Evaluation (Schwartz), University of Toronto; Dalla Lana School of Public Health (Buchan, Kwong), University of Toronto; Public Health Ontario (Kwong), Toronto Ont.

Institute for Clinical Evaluative Sciences (Schwartz, Jembere, Campitelli, Chung, Kwong); Institute of Health, Policy, Management, and Evaluation (Schwartz), University of Toronto; Dalla Lana School of Public Health (Buchan, Kwong), University of Toronto; Public Health Ontario (Kwong), Toronto Ont.

Institute for Clinical Evaluative Sciences (Schwartz, Jembere, Campitelli, Chung, Kwong); Institute of Health, Policy, Management, and Evaluation (Schwartz), University of Toronto; Dalla Lana School of Public Health (Buchan, Kwong), University of Toronto; Public Health Ontario (Kwong), Toronto Ont.