GJB2 and Hodgkins lymphoma: Methodology In this study, 30 children with HL were evaluated for clinical features and tested for the expression of <i>GJB2</i>, <i>GJB3</i>, <i>SLC26A4,</i> and <i>MT-RNR1</i> using reverse transcription-polymerase chain reaction, with genetic analyses performed before cochlear implantation.