Accepted for Publication: April 20, 2011.
Author Contributions: The first author had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Drs Tremblay, Falissard, and Côté share senior authorship. Study concept and design: Pryor, Tremblay, Boivin, and Côté. Acquisition of data: Tremblay, Boivin, and Falissard. Analysis and interpretation of data: Pryor, Tremblay, Touchette, Dubois, Genolini, and Liu. Drafting of the manuscript: Pryor, Tremblay, and Côté. Critical revision of the manuscript for important intellectual content: Pryor, Tremblay, Boivin, Touchette, Dubois, Genolini, Liu, Falissard, and Côté. Statistical analysis: Pryor, Tremblay, Genolini, Liu, Falissard, and Côté. Obtained funding: Pryor, Tremblay, and Boivin. Administrative, technical, and material support: Tremblay and Falissard. Study supervision: Tremblay, Touchette, Dubois, and Côté.
Financial Disclosure: None reported.
Funding/Support: This research was supported in part by the Fonds pour la Recherche en Santé du Québec, the St Justine Hospital's Research Center, the Canadian Institute for Health Research, the Quebec Ministry of Health and Social Services, the Quebec Ministry of Families and Seniors, the Lucie and André Chagnon Foundation, the Canadian Institutes for Health Research, the Social Science and Humanities Research Council of Canada, the Quebec Fund for Research on Society and Culture, and the Canada Research Chair Program.
Additional Contributions: We thank the Quebec Institute of Statistics and the GRIP staff for data collection and management.