audiology child childhood cleftpalate complications congresses deafchildren diagnosis diseases ear eardiseases etiology familyrelationships hearingaids hearingdisorders hearingdisordersininfants hearingimpairedchildren hearingloss hearingtests infant ininfancy ininfancyandchildhood medicalscreening middle middleear rehabilitation rehabilitationofhearingimpaired standards testing therapy wv272m478s1988 wv274h4351975 wv440c626