existing guidelines Not later than two years after the date of the enactment of this Act, the Secretary of Veterans Affairs, in consultation with the Secretary of Defense and the Secretary of Health and Human Services, shall complete an assessment of the 2016 Clinical Practice Guidelines for the Management of Major Depressive Disorders to determine whether an update to such guidelines is necessary. (d) Work group (1) Establishment The Secretary of Veterans Affairs, the Secretary of Defense, and the Secretary of Health and Human Services shall create a work group to develop the clinical practice guideline or guidelines under subsection (a) to be known as the Serious Mental Illness Work Group (in this subsection referred to as the Work Group ). (2) Membership The Work Group created under paragraph (1) shall be comprised of individuals that represent Federal Government entities and non-Federal Government entities with expertise in the areas covered by the Work Group, including the following entities: (A) Academic institutions that specialize in research for the treatment of conditions described in subsection (a). (B) The Health Services Research and Development Service of the Department of Veterans Affairs. (C) The Office of the Assistant Secretary for Mental Health and Substance Use of the Department of Health and Human Services. (D) The National Institute of Mental Health. (E) The Indian Health Service. (F) Relevant organizations with expertise in researching, diagnosing, or treating conditions described in subsection (a). (3) Relation to other work groups The Work Group shall be created and conducted in the same manner as other work groups for the development of clinical practice guidelines for the Department of Veterans Affairs and the Department of Defense. (e) Rule of construction Nothing in this section shall be construed to prevent the Secretary of Veterans Affairs and the Secretary of Defense from considering all relevant evidence, as appropriate, in creating the clinical practice guideline or guidelines