Estimating Influenza Vaccine Effectiveness in Community-Dwelling Elderly Patients Using the Instrumental Variable Analysis Method
Kenny Wong, MPH, Michael A. Campitelli, MPH, Thérèse A. Stukel, PhD, Jeffrey C. Kwong, MD, MSc
Arch Intern Med. 2012;172(6):484-491.
Published online March 26, 2012
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