Drew, D. A., S. M. Chin, K. K. Gilpin, M. Parziale, E. Pond, M. M. Schuck, K. Stewart, et al. 2017. “ASPirin Intervention for the REDuction of colorectal cancer risk (ASPIRED): a study protocol for a randomized controlled trial.” Trials 18 (1): 50. doi:10.1186/s13063-016-1744-z. http://dx.doi.org/10.1186/s13063-016-1744-z.