[1] Harefield Hosp, London, England
[2] Rigshosp, DK-2100 Copenhagen, Denmark
[3] Great Ormond St Hosp Sick Children, London WC1N 3JH, England
[4] Freeman Rd Hosp, Newcastle Upon Tyne NE7 7DN, Tyne & Wear, England
[5] Hop Europeen Georges Pompidou, Paris, France
[6] SM della Misericordia, Udine, Italy
[7] Wythenshawe Hosp, Manchester M23 9LT, Lancs, England
[8] Univ Padua, Padua, Italy
[9] Papworth Hosp, Cambridge CB3 8RE, England
[10] Univ Hosp, La Coruna, Spain
[11] Hosp Santa Cruz, Lisbon, Portugal
[12] Aarhus Univ Hosp, DK-8000 Aarhus, Denmark
[13] Inst Clin & Expt Med, Prague, Czech Republic
[14] Univ Hosp A Michallon, Grenoble, France
[15] S Orsola Malpighi, Bologna, Italy
[16] Univ Hosp Reine Sofia, Cordoba, Spain
[17] Lund Univ, Lund, Sweden
[18] Queen Elizabeth Univ Hosp, Birmingham, W Midlands, England
[19] Ctr Hosp Univ Dupuytren, Limoges, France
[20] Univ Navarra, E-31080 Pamplona, Spain
[21] Univ Helsinki, Cent Hosp, Helsinki, Finland
[22] Hosp Clin Barcelona, Barcelona, Spain
[23] Univ Hosp, Oslo, Norway
[24] Inst Univ Pathol, Lausanne, Switzerland
[25] Clin Univ St Luc, B-1200 Brussels, Belgium
[26] Univ Ege, Izmir, Turkey