[1] Leeds Teaching Hosp, Leeds, W Yorkshire, England
[2] Univ Nijmegen, Nijmegen, Netherlands
[3] Univ York, York YO10 5DD, N Yorkshire, England
[4] Hop Avicenne, F-93009 Bobigny, France
[5] Univ Patras, GR-26110 Patras, Greece
[6] Hosp Univ La Fe, Valencia, Spain
[7] Karolinska Inst, Stockholm, Sweden
[8] Charles Univ Prague, Prague, Czech Republic
[9] Fundeni Clin Inst, Bucharest, Romania
[10] Univ Dusseldorf, Dusseldorf, Germany
[11] Innsbruck Med Univ, Innsbruck, Austria
[12] Univ Pavia, I-27100 Pavia, Italy