Reis R, Antunes A
Respiratory Department, Centro Hospitalar de Trás-os-Montes e Alto Douro, Vila Real, Portugal.
Respiratory Department, Centro Hospitalar de Vila Nova de Gaia/Espinho, Portugal.
Rev Port Pneumol. 2014 May-Jun;20(3):173-4. doi: 10.1016/j.rppneu.2014.01.005. Epub 2014 Mar 11.