Joana Clemente Duarte1, Rita Leal2, Luís Escada2, Tiago M Alfaro3. 1. Pneumology Unit A, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal. Electronic address: Joana_Duarte_17@hotmail.com. 2. Nephrology Unit, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal. 3. Pneumology Unit A, Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.