title: Comorbidities: A phenomenon that is not unique to Internal Medicine.
authors.affiliation: Instituto de Investigación Sanitaria de Aragón, Servicio de Medicina Interna, Hospital Clínico Universitario «Lozano Blesa», Zaragoza, España. Electronic address: fruizl@unizar.es.
authors.forename: F J
authors.initials: FJ
authors.lastname: Ruiz Laiglesia
authors.affiliation: Servicio de Medicina Interna, Hospital Universitario «Miguel Servet», Zaragoza, España.
authors.forename: J
authors.initials: J
authors.lastname: Díez-Manglano