[1] Brigham & Womens Hosp, Dept Med, Div Cardiovasc, Boston, MA 02115 USA
[2] London Sch Hyg, London, England
[3] Univ Glasgow, Glasgow, Lanark, Scotland
[4] Duke Univ, Med Ctr, Durham, NC USA
[5] McMaster Univ, Hamilton, ON, Canada
[6] Sahlgrenska Univ, Ostra Hosp, Gothenburg, Sweden
[7] Cleveland Clin Fdn, Cleveland, OH USA
[8] AstraZeneca LP, Wilmington, DE USA