† Representation does not imply endorsement by the American College of Physicians. The American Heart Association makes every effort to avoid any actual or potential conflicts of interest that may arise as a result of an outside relationship or a personal, professional, or business interest of a member of the writing panel. Specifically, all members of the writing group are required to complete and submit a Disclosure Questionnaire showing all such relationships that might be perceived as real or potential conflicts of interest. This statement was approved by the American Heart Association Science Advisory and Coordinating Committee on January 7, 2011. A copy of the statement is available at http://www. americanheart. org/presenter. jhtml? identifier3003999 by selecting either the “topic list” link or the “chronological list” link. To purchase additional reprints, call 843-216-2533 or e-mail kelle. ramsay@ wolterskluwer. com.