[1] Univ Glasgow, Western Infirm, Dept Cardiol, Glasgow G11 6NT, Lanark, Scotland
[2] Karolinska Hosp, S-10401 Stockholm, Sweden
[3] Brigham & Womens Hosp, Boston, MA 02115 USA
[4] Sahlgrens Univ Hosp, Dept Med, S-41345 Gothenburg, Sweden
[5] Duke Univ, Ctr Med, Durham, NC USA
[6] HGM McMaster Clin, Hamilton, ON, Canada
[7] Astrazeneca, R&D, Molndal, Sweden
[8] Astrazeneca LP, Wayne, PA USA