The provisions of this section shall apply only to the Chowchilla Memorial Hospital District, and to any other hospital district with a bed capacity of less than 100 beds, which has entered into a joint powers agreement with the Chowchilla Memorial Hospital District. The Chowchilla Memorial Hospital District, or other district specified in this section, shall have the authority to employ physicians in the local community and such physicians, as employees of the district shall be covered for medical injury tort liability by the district.