sentences:  Thunder Bay Regional Health Sciences Centre's emergency department is one of the busiest in Canada, receiving over 106,000 annual visits.Thunder Bay Regional Health Sciences Centre was created in 2004 as an amalgamation of the Port Arthur and McKellar branches of the Thunder Bay Regional Hospital system.Patients from both hospitals were relocated on February 22 and 23, 2004, at which time the name was changed to Thunder Bay Regional Health Sciences Centre.