1. Hospital Clínico San Carlos, IDISSC, Universidad Complutense de Madrid , Calle del Prof Martín Lagos , 28040 Madrid, Spain
2. Centro Hospitalar Universitário do Algarve, Hospital de Faro , Faro , Portugal
3. Faculty of Biomedical and Health Sciences, Universidad Europea de Madrid , 28670 Villaviciosa de Odón , Spain