[1] Univ Roma La Sapienza, Rome, Italy
[2] Univ Melbourne, Heidelberg, Vic, Australia
[3] Rigshosp, Copenhagen Univ Hosp, Danish MS Ctr, DK-2100 Copenhagen, Denmark
[4] Natl MS Ctr Melsbroek, Brussels, Belgium
[5] Vrije Univ Brussel, Brussels, Belgium
[6] Hop G&R Laennec, CHU Nantes, Nantes, France
[7] Radboud Univ Nijmegen, Med Ctr, NL-6525 ED Nijmegen, Netherlands
[8] Ctr Hosp Porto, Hosp Santo Antonio, Oporto, Portugal
[9] Univ London Imperial Coll Sci Technol & Med, London, England