McLellan AT, Skipper GS, Campbell M, DuPont RL. Five year outcomes in a cohort study of physicians treated for substance use disorders in the United States. BMJ 2008;337:a2038 doi:10.1136/bmj
Geuijen P, de Rond M, Kuppens J, Atsma F, Schene A, de Haan H, et al. Physicians' norms and attitudes towards substance use in colleague physicians: A cross-sectional survey in the Netherlands. PLOS ONE. 2020 Apr 3;15(4):e0231084. doi: 10.1371/journal.pone.0231084.