H. U. Marqués de Valdecilla, Santander
Johns Hopkins Bayview Medical Center, Baltimore, USA
The Johns Hopkins School of Medicine, Baltimore, USA
St Thomas' Hospital, London, UK
Dianalund and Aarhus University Hospital, Aarhus, Denmark
H. U. Marqués de Valdecilla, Santander
H. U. Marqués de Valdecilla, Santander
H. de Cruces, Baracaldo