External quality assessment for CD4 + T-lymphocyte count test: Performance of the Brazilian public health laboratories network Gaspar, P.âm.C.; Wohlke, B.L.P.; Brunialti, M.K.C.ó; Pires, A.F.áv.; Kohiyama, I.M.; Salomão, R.; Alonso Neto, J.é B.; Júnior, O.d.C.F.; Franchini, M.; Bazzo, M.L.; Benzaken, A.S. Medicine 97(1s Suppl 1: S32-S37 2018 https://eurekamag.com/research/064/359/064359161.php