... University of Toronto, Toronto, Canada, 5Department of Epidemiology, Dalla Lana School of Public Health, University of Toronto, Toronto, Canada, 6Department of Pathobiology and Laboratory Medicine, ... drafting of the manuscript. ALG participated in the design of the study and contributed to the drafting of the manuscript. GBcontributed to test development and laboratory testing of specimens. ... conceived and participated in the design of the study, contributed to test development and labora-tory testing of specimens, and contributed to the drafting of the manuscript. All authors read and...