The website established pursuant to section 16L of chapter 6A of the General Laws shall be operational and shall include links to other websites that display comparative cost and quality information not later than September 1, 2007. The website shall include comparative cost information by facility, clinician or physician group practice for obstetrical services, physician office visits, high-volume elective surgical procedures, high-volume diagnostic tests and high-volume therapeutic procedures, not later than March 1, 2008; provided, however, that such cost information shall include the average payment made on behalf of insured patients for each service or category of service received by each facility, clinician or physician group practice.