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Continuous and bimonthly publicationISSN (on-line): 1806-3756
Cecilia Maria Patino1,2,a, Juliana Carvalho Ferreira1,3,b
DOI: http://dx.doi.org/10.1590/S1806-37562018000000164
Patino1 CM, 2 , a , Ferreira1 JC, 3 , b . Internal and external validity: can you apply research study results to your patients?. J Bras Pneumol. 2018;44(3):183