; categorization The Secretary shall enroll at least 1,500 eligible veterans who apply for the pilot program, giving preference to veterans with service-connected disabilities that increases in accordance with the veterans’ disability ratings under chapter 11 of title 38, United States Code, in a manner that ensures the following: (A) One-third of eligible veterans enrolled in the pilot program shall have been diagnosed with no or mild periodontitis under paragraph (2). (B) Two-thirds of eligible veterans enrolled in the pilot program shall have been diagnosed with moderate to severe periodontitis under paragraph (2). (d) Duration of program The Secretary shall carry out the pilot program during the four-year period beginning on the date that is 180 days after the effective date of this section. (e) Locations The pilot program shall be carried out in five facilities of the Veterans Health Administration, with one such facility in each of five Veterans Integrated Services Networks that the Secretary considers appropriate for the pilot program. (f) Patient distribution Each facility shall serve not more than one-fourth and not fewer than one-sixth of the veterans enrolled in the pilot program, in approximately even proportions of veterans categorized under subsection (c)(3). (g) Course of program (1) Periodontal therapy The Secretary shall make timely and appropriate periodontal therapy available to veterans described in subsection (c)(3)(B). (2) Election of treatment Such veterans who elect to receive treatment shall be classified as treated . (3) Annual evaluations Each treated veteran shall receive an annual dental evaluation, during which the periodontal health of the treated veteran shall be reassessed and recorded exactly as at the initial evaluation under subsection (c)(2). (4) Health outcome reporting For the duration of the pilot program, the Secretary shall collect and record data regarding the health of treated veterans, including events, treatments, and outcomes, and make such data available for