The board shall keep all information relating to the receipt and investigation of complaints filed against licensees or applicants confidential until the information is disclosed in the course of the investigation or any subsequent proceeding before the board. Patient records, including clinical records, files, any other report or oral statement relating to diagnostic findings or treatment of patients, any information from which a patient or his or her family might be identified, or information received and records or reports kept by the board as a result of an investigation made pursuant to this chapter shall not be available to the public and shall be kept confidential by the board.