No single contract between any such corporation and its subscribers shall entitle more than one person to indemnity, except that a single contract may be issued to subscriber and spouse, to subscriber and family by marriage or adoption or to subscriber and ward. Such contract shall be in writing and a copy thereof shall be furnished to each subscriber and shall contain the following provisions: (1) A statement of the amount payable to the corporation by the subscriber and the manner in which such amount is payable; (2) a statement of the amount of indemnity to be furnished and the period during which it will be furnished, and, if there are to be exceptions, a detailed statement of such exceptions; (3) a statement of terms and conditions upon which the contract may be cancelled or otherwise terminated at the option of either party; (4) a statement that the contract includes the endorsements thereon and attached papers, if any, and contains the entire contract; (5) a statement that no statements by the subscriber in the subscriber’s application for a contract shall void the contract or be used in any legal proceeding thereunder, unless such application or an exact copy thereof is included in or attached to such contract; (6) a statement of the period of grace that will be allowed the subscriber for making any payment due under the contract, which period shall not be less than ten days; and (7) a statement that no action at law based upon or arising out of the physician-patient relationship shall be maintained against a nonprofit medical service corporation.