; or (ii) limited evidence or suggestive evidence of such an association. (C) Any notice published under subparagraph (A) shall include an explanation of the scientific basis for the determination described in subparagraph (B). (D) If a disease already presumed to be service connected under this section is subject to a determination described in subparagraph (B), the Secretary shall, not later than 60 days after publication of the notice under subparagraph (A), issue proposed regulations removing the presumption of service connection for the disease. (4) Not later than 180 days after the date on which the Secretary issues any proposed regulations under this subsection, the Secretary shall issue final regulations. (d) Removal of presumption of service connection Whenever the presumption of service connection for a disease under this section is removed under subsection (c)— (1) a veteran who was awarded compensation for the disease on the basis of the presumption before the effective date of the removal of the presumption shall continue to be entitled to receive compensation on that basis