1. Infectious Diseases Unit; Elche University General Hospital; University Miguel Hernández; Alicante Spain
2. Statistics; Operational Research Center; University Miguel Hernández; Elche, Alicante Spain
3. Infectious Diseases Unit; La Paz-Carlos III-Cantoblanco Hospital; Madrid Spain
4. Infectious Diseases Unit; Son Espases University Hospital; Palma de Mallorca Spain
5. Infectious Diseases Unit; Asturias Central University Hospital; Oviedo Spain