[1] Univ Colorado Hosp, Aurora, CO USA
[2] Univ Med Ctr Rotterdam, Gravendijkwal, Netherlands
[3] Univ Klinikum Heidelberg, Heidelberg, Germany
[4] Boehringer Ingelheim Int, Ingelheim, Germany
[5] Decis Resources Grp, Burlington, MA USA
[6] UCL, London, England