CHICAGO, IL - OCTOBER 18: Northwestern Memorial Foundation in partnership with Children's Memorial Hospital presented the twenty third annual Arthur DeBoer, MD Lectureship in Cardiothoracic Surgery on Thursday, October 18, 2012 in the Pritzker Auditorium of the Feinberg Pavilion at Northwestern Memorial Hospital in Chicago, Illinois. This year's lecture was presented by Carl Lewis Backer, MD of Children's Memorial Hospital. Photo credit: Randy Belice