; and (2) recommendations for administrative or legislative actions required to address issues identified in the study under subsection (a). (c) Continued tracking of cholangiocarcinoma in veterans of the Vietnam era The Secretary shall track the prevalence of chol­an­gio­car­ci­no­ma in veterans of the Vietnam era using the Veterans Affairs Central Cancer Registry, and provide such information to Congress as required under subsection (d). (d) Follow-Up reports The Secretary shall periodically submit to the Congress an updated report under subsection (b), as determined by the Secretary. (e) Definitions In this section: (1) The term Secretary means the Secretary of Veterans Affairs. (2) The term Vietnam era has the meaning given such term in section 101 of title 38, United States Code. (3) The term veterans of the Vietnam era has the meaning given such term in section 4211 of title 38, United States Code.