. "The mental health board may schedule a review hearing (a) at any time pursuant to section 71-937 or 71-938, (b) upon the request of the subject, the subject's counsel, the subject's legal guardian or conservator, if any, the county attorney, the official, agency, or other person or entity designated by the mental health board under section 71-931 to prepare and oversee the subject's individualized" . . . . . . . .