- Lung function will be tested using a total body plethysmography (Eric Jaeger, Germany), and the calibration will be checked before each evaluation. Spirometry will be performed in accordance with American Thoracic Society and European Respiratory Society (ATS/ERS) standards (Miller et al., 2005; Wanger et al., 2005). The predicted values will be calculated with the equations derived from Brazilian population (Pereira et al., 2007; Neder et al., 1999).