Meetings of the investigative panels must be held at least once annually in Bismarck, North Dakota, and at such other place or places within the state and at such times as each investigative panel may determine. A majority of the members of an investigative panel constitutes a quorum, and no action of an investigative panel is effective without the concurrence therein of a majority of the members present at the time of the decision. Special meetings of an investigative panel may be called at any time by the chairman or vice chairman of an investigative panel or upon the written request of any three members of an investigative panel.