1. From the Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
2. Correspondence: Gilbert H. Mudge, MD Division of Cardiovascular Medicine, Brigham and Women's Hospital, 75 Francis Street, Boston, MA 02115, USA T: +1-617-732-7140 F: +1-617-264-5265 gmudge@partners.org Accepted for publication August 2009