1. Unidade de Fisiologia Pulmonar, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre (RS) Brasil.
2. Pulmonary Function Laboratory, Hotel Dieu Hospital, Division of Respiratory and Sleep Medicine, Queen's University, Kingston, ON, Canada.
a. http://orcid.org/0000-0002-8393-3126; b. http://orcid.org/0000-0002-8019-281X