Notwithstanding any other provision of law, the offering and operation by a medical corporation of a health care service plan licensed pursuant to the provisions of Chapter 2.2 (commencing with Section 1340) of Division 2 of the Health and Safety Code is hereby authorized. For such purpose a medical corporation may employ, or enter into contracts or other arrangements with, any person or persons authorized to practice any of the healing arts, but no such employment, contract, or arrangement shall provide for the rendering, supervision, or control of professional services other than as authorized by law.