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
Warttig SL, Forshaw MJ, South J, White AK. New, normative, English-sample data for the Short Form Perceived Stress Scale (PSS-4). J Health Psychol. 2013 Dec;18(12):1617-28. doi: 10.1177/1359105313508346