The board shall consist of five professional members and one public member appointed pursuant to section 38-158. The members shall meet the requirements of sections 38-164 and 38-165. The professional members shall consist of three licensed hearing instrument specialists, one otolaryngologist, and one audiologist until one licensed hearing instrument specialist vacates his or her office or his or her term expires, whichever occurs first, at which time the professional members of the board shall consist of three licensed hearing instrument specialists, at least one of whom does not hold a license as an audiologist, one otolaryngologist, and one audiologist. At the expiration of the four-year terms of the members serving on December 1, 2008, successors shall be appointed for five-year terms.