[1] Univ Liverpool, Liverpool Ctr Cardiovasc Sci, West Derby St, Liverpool L7 8TX, Merseyside, England
[2] Liverpool Heart & Chest Hosp, Liverpool, Merseyside, England
[3] Aalborg Univ, Aalborg Thrombosis Res Unit, Dept Clin Med, Aalborg, Denmark
[4] Harvard Med Sch, Cardiovasc Med Div, Brigham & Womens Hosp, Boston, MA 02115 USA
[5] Uniformed Serv Univ Hlth Sci, F Edward Hebert Sch Med, Bethesda, MD 20814 USA