1 University of Leuven, Leuven, Belgium; University of Oxford, Oxford, United Kingdom; Università Cattolica del Sacro Cuore, Milan, Italy; Moscow State University, Moscow, Russia; Gruppo Italo Belga, Rome, Italy.
2 Università Cattolica del Sacro Cuore, Milan, Italy; Gruppo Italo Belga, Rome, Italy.
3 Moscow State University, Moscow, Russia.
4 Landeskrankenhaus Villach, Villach, Austria; University of Ulm, Ulm, Germany.
5 University of Ulm, Ulm, Germany; University of Strasbourg, Strasbourg, France.