Silva Filho, L. V. F. da, M. H. de C. F. Bussamra, C. M. A. Nakaie, F. V. Adde, J. C. Rodrigues, S. Raskin, and T. Rozov. “ Cystic Fibrosis With Normal Sweat Chloride Concentration: Case Report ”. Revista Do Hospital Das Clínicas, vol. 58, no. 5, Jan. 2003, pp. 260-2, doi:10.1590/S0041-87812003000500005.