title: The difficult-to-wean patient.
authors.affiliation: Cardiothoracic Department, Pulmonary Unit, University Hospital of Pisa, Via Paradisa 2, Cisanello, Pisa, Italy. n.ambrosino@ao-pisa.toscana.it
authors.forename: Nicolino
authors.initials: N
authors.lastname: Ambrosino
authors.forename: Luciano
authors.initials: L
authors.lastname: Gabbrielli