1. A majority of the board of directors of a corporation providing or rendering hospital services shall be persons who are not duly appointed representatives of hospitals with which the corporation has contracts for the rendering of hospital services.
2. A majority of the board of directors of a corporation providing medical services shall be persons who are not physicians or duly appointed representatives of the physicians who have signed participating agreements with the corporation for the rendering of medical services.
3. A majority of the board of directors of a corporation providing dental services shall be persons who are not dentists or duly appointed representatives of the dentists who have signed participating agreements with the corporation for the rendering of dental services.
4. This section does not apply to any duly appointed representative of a hospital, physician or dentist who is a member of the board of directors of a corporation on July 1, 1977. Such a person may continue to serve as a member of the board of directors until the term of the person expires.