Genotyping of methicillin-resistant Staphylococcus aureus isolates obtained in the Northeast region of Brazil oleh F.C. de Sousa-Junior, M.C. Silva-Carvalho, M.J.B.C. Fernandes, M.F.P. Vieira, F.L.P.C. Pellegrino, A.M.S. Figueiredo, M.C.N. de Melo, E.P. Milan