Regulation 17 of the Principal Regulations is amended by omitting subregulation (1) and substituting the following subregulation:(1) For the purpose of section 73(3) of the Act, the class of persons is the class consisting of persons who are (a) medical practitioners with specialised qualifications and experience in otorhinolaryngology; or(b) full members, or qualified to be full members, of the Audiological Society of Australia.