the hospitals
University Hospital Heidelberg (Germany), Prof. W. Wick
Universitätsklinikum Tübingen (Germany), Prof. G. Tabatabai
University Hospital Geneva (Switzerland), Prof. P.-Y. Dietrich
Leiden University Medical Centre (The Netherlands), Dr. J.R. Kroep
Vall d’Hebron University Hospital (Spain), Prof. J. Sahuquillo
Rigshospitalet Copenhagen (Denmark), Prof. U. Lassen