1966- alex biography childrenwithspecialneeds claireh cochlearimplantation congresses deafchildren denworth diagnosis electrocochleography family fitness hea035000sci089000fam012000 health healthblatchford healthdenworth hearing hearingloss languageacquisition lifesciences lydia methods neuroscience parentparticipation patients rehabilitation relationships rf305 science speech surgery unitedstates wv274 wv274b644c2014 wv274i5992c2004