20170506152300.0 1912-3590 1912-3590 Annual report of the Chief Medical Officer of Health to the Ontario Legislative Assembly. 1912-3590 Annual report of the Chief Medical Officer of Health to the Ontario Legislative Assembly 1912-3590 Canada 1912-3590 Annual report of the Chief Medical Officer of Health to the Ontario Legislative Assembly Annual report of the Chief Medical Officer of Health to the Ontario Legislative Assembly.