Ghasemiesfe, Mehrnaz and Barrow, Brooke and Leonard, Samuel (2019) Association between marijuana use and risk of cancer: a systematic review and meta-analysis. JAMA Network Open, 2, (11: e1916318), 10.1001/jamanetworkopen.2019.16318.

Keyhani, Salomeh and Leonard, Samuel and Byers, Amy L and Zaman, Tauheed and Krebs, Erin and Austin, Peter C and Moss-Vazquez, Tristan and Austin, Charles and Sandbrink, Friedhelm and Bravata, Dawn M (2022) Association of a positive drug screening for cannabis with mortality and hospital visits among veterans affairs enrollees prescribed opioids. JAMA Network Open, 5, (12), e2247201. doi: 10.1001/jamanetworkopen.2022.47201.