; and (B) by follow-on screening performed, whereby the analysis demonstrates to what extent screening computed tomography co­lo­nog­ra­phy was used as a substitute for a previous screening procedure. (3) Access to screening computed tomography colonography by Medicare beneficiaries, especially in rural areas or underserved populations, before and after the date of implementation of coverage of such screening benefit under the Medicare program pursuant to the enactment of this Act. (4) Recommendations for such legislation and administrative action as the Secretary determines appropriate to implement this Act.