The superintendent of each institute must be qualified by experience and training in the administration of human service programs. A physician shall not serve as both superintendent and business manager. A hospital administrator or other person qualified in business management appointed superintendent may also be designated to perform the duties of business manager without additional compensation. A physician appointed superintendent shall be designated clinical director and shall perform the duties imposed on the superintendent by section 226.6, subsection 1, and such other duties of the superintendent as must by their nature be performed by a physician.