1. Service of Microbiology, University Hospital Marqués de Valdecilla – HUMV, Avda de Valdecilla s/n, 39008 Santander, Spain
2. Medicine and Psychiatry Department, School of Medicine, University of Cantabria, Avda Herrera Oria s/n, 39011 Santander, Spain
3. Service of Haematology, University Hospital Marqués de Valdecilla – HUMV, Avda de Valdecilla s/n, 39008 Santander, Spain
4. Molecular Biology Department, School of Medicine, University of Cantabria, Avda Herrera Oria s/n, 39011 Santander, Spain