[1] Eli Lilly, Windlesham, Surrey, England
[2] Southampton Gen Hosp, MRC Environm Epidemiol Unit, Southampton SO9 4XY, Hants, England
[3] Univ Verona, I-37100 Verona, Italy
[4] Hosp Nord, Amiens, France
[5] Univ Wurzburg, Wurzburg, Germany
[6] Servimed, Lisbon, Portugal
[7] Hosp La Paz, Madrid, Spain
[8] Evangelismos Gen Hosp, Athens, Greece
[9] Univ York, York YO10 5DD, N Yorkshire, England