(1) This section applies if the chief health officer—
(a) has been notified by notice under section 42 or section 43 (the cancer notice ) that a person (the cancer patient ) has cancer; and
(b) the cancer notice is unclear.
(2) The chief health officer may, by written notice, request a doctor who has professionally attended the cancer patient to give the chief health officer any specified information required to be included in the cancer notice.