; (B) cardiovascular events; (C) head, neck, and oral cancer; (D) testicular cancer; (E) ovarian cancer; (F) transitional cell cancer; (G) intestinal inflammation; (H) motor vehicle accidents; or (I) spasticity. (b) Long-Term observational study The Secretary may carry out a long-term observational study of the participants in the clinical trials required by subsection (a). (c) Type of cannabis (1) In general In carrying out the clinical trials required by subsection (a), the Secretary shall study varying forms of cannabis, including whole plant raw material and extracts, and may study varying routes of administration. (2) Plant cultivars Of the varying forms of cannabis required under paragraph (1), the Secretary shall study plant cultivars with varying ratios of tetrahydrocannabinol to cannabidiol. (d) Implementation Not later than 18 months after the date of the enactment of this Act, the Secretary shall— (1) develop a plan to implement this section and submit such plan to the Committee on Veterans’ Affairs of the Senate and the Committee on Veterans’ Affairs of the House of Representatives