1. Hospital Clínic-IDIBAPS, University of Barcelona, Barcelona, Spain.
2. Hospital de Sant Pau, Barcelona, Spain.
3. Hospital Bellvitge-IDIBELL, University of Barcelona, Barcelona, Spain.
4. Hospital Universitario La Paz, IdiPAZ, Madrid, Spain.
5. Hospital Universitari Vall d'Hebron, Barcelona, Spain.
6. Hospital de Donostia, San Sebastian, Spain.