Nothing in Section 676.2 shall preclude, while the policies are in force, changes in the rate upon which the premium is based or the conditions of coverage, or both, of policies insuring health care facilities licensed pursuant to Chapter 2 (commencing with Section 1250) of Division 2 of the Health and Safety Code, if the change is imposed pursuant to the recommendation of a health care facility professional liability advisory committee advising the insurer; provided that a majority of the members of the committee are duly authorized representatives of health care facilities licensed pursuant to that Chapter 2 (commencing with Section 1250) of Division 2 of the Health and Safety Code, and written notification of the change is given to all affected insureds at least 30 days prior to any such change.