Prevalence of the A1555G (12S rRNA) and tRNASer(UCN) mitochondrial mutations in hearing-impaired Brazilian patients - Abreu-Silva, Ronaldo Serafim; Lezirovitz, Karina; Braga, M. C. C.; Spinelli, M.; Pirana, Sulene; Della-Rosa, Valter Augusto; Otto, Paulo A; Mingroni Netto, Regina Celia (Brazilian Journal of Medical and Biological Research, 2006)