specialties, including clinical endocrinologists, that play a role in the prevention or treatment of diseases and complications described in subsection (a). (B) Primary care physicians. (C) Non-physician health care professionals. (D) Patient advocates. (E) National experts, including public health experts, in the duties listed under subsection (c). (F) Health care providers furnishing services to a patient population that consists of a high percentage (as specified by the Secretary) of individuals who are enrolled in a State plan under title XIX of the Social Security Act or who are not covered under a health plan or health insurance coverage. (3) Chairperson The members of the Commission shall select a chairperson from the members appointed under paragraph (2). (4) Meetings The Commission shall meet at least twice, and not more than four times, a year. (5) Vacancies A vacancy on the Commission shall be filled in the same manner as the original appointments. (c) Duties The Commission shall evaluate and make recommendations, as appropriate, to the Secretary of Health and Human Services and Congress regarding— (1) Federal programs of the Department of Health and Human Services that focus on preventing and reducing the incidence of the diseases and complications described in subsection (a)