1. Ludwig-Maximilians-University, Munich, Germany
2. S. Cuore Hospital, Negrar, Verona, Italy; ‡Reggio Emilia Hospital, Reggio, Italy
3. University of Amsterdam, Amsterdam, the Netherlands
4. Karolinska Hospital, Stockholm, Sweden
5. Worldwide Travel Medical Consultants, Northcliff, South Africa
6. Ullevaal Hospital, Oslo, Norway
7. Bradford Royal Infirmary, Bradford, United Kingdom
8. General Hospital, Bergamo, Italy