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Revista Portuguesa de Pneumologia (English Edition) > 2006 > 12 > 1 > 9-30
Journal of Clinical Epidemiology > 2013 > 66 > 1 > 44-51
Revista Portuguesa de Pneumologia (English Edition) > 2006 > 12 > 1 > 9-30
Journal of Clinical Epidemiology > 2013 > 66 > 1 > 44-51