Yuguero O, Marsal JR, Buti M, Esquerda M, Soler-Gonzalez J. Descriptive study of association between quality of care and empathy and burnout in primary care. BMC Med Ethics. 2017 Sep 26;18(1):54. doi: 10.1186/s12910-017-0214-9
Niaura R, Britt DM, Shadel WG, Goldstein M, Abrams D, Brown R. Symptoms of depression and survival experience among three samples of smokers trying to quit. Psychol Addict Behav. 2001 Mar 1;15(1):13-7.