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Creation of the study cohort.*Restricted to urban and suburban areas in Toronto and surrounding communities (Burlington, Oakville, Mississauga, Brampton, Richmond Hill, Vaughan, Markham, Pickering, Ajax, Whitby and Oshawa). †Among women who immigrated to Canada in 1985 or later. Values in brackets reflect the no. of women who gave birth. OHIP = Ontario Health Insurance Plan.
