23. A copy of the application and affidavit together with notice of the day fixed for the hearing shall be served on the following;-
(a) (i) if the patient is under confinement, on the superintendent of the hospital or the licensee of the premises in which he is confined; or
(ii) if the patient has been allowed to be absent on parole, on the person in whose charge he is; or
(iii) if the patient has been discharged, on the patient himself: and
(b) on the proposed administrator where this person is not the applicant: and
(c) on such other person as the District Court may direct whose presence at the hearing of the application is in its opinion desirable.