1. North Bristol NHS Trust, Bristol, United Kingdom
2. University of Thessaly, Larissa, Greece
3. University Hospital, Zurich, Switzerland
4. Gregorio Marañón General University Hospital, Madrid, Spain
5. Hospital Santa Maria delle Croci, Ravenna, Italy
6. Noordwest Ziekenhuisgroep, Alkmaar, the Netherlands
7. ASST Spedali Civili, Brescia, Italy
8. Ospedale del Mare, Naples, Italy
9. Lozano Blesa General University Hospital, Zaragoza, Spain
10. OLVG Hospital, Amsterdam, Netherlands
11. KAT General Hospital of Attica, Kifisia, Greece