1 Division of Clinical Immunology and Allergy, Department of Medicine (Chu, Oykhman), and Department of Health Research Methods, Evidence & Impact (Chu), McMaster University and The Research Institute of St. Joe's Hamilton, Ont.; Division of Clinical Immunology & Allergy (Sussman), Department of Medicine, University of Toronto, Toronto, Ont. chudk@mcmaster.ca.
2 Division of Clinical Immunology and Allergy, Department of Medicine (Chu, Oykhman), and Department of Health Research Methods, Evidence & Impact (Chu), McMaster University and The Research Institute of St. Joe's Hamilton, Ont.; Division of Clinical Immunology & Allergy (Sussman), Department of Medicine, University of Toronto, Toronto, Ont.