title: Preface.
authors.affiliation: President of the Spanish Society of Transplantation. Electronic address: valentin.cuervasmons@uam.es.
authors.forename: Valentín
authors.initials: V
authors.lastname: Cuervas-Mons
authors.affiliation: Secretary of the Spanish Society of Transplantation. Electronic address: mlopezhoyos@humv.es.
authors.forename: Marcos
authors.initials: M
authors.lastname: López-Hoyos