Wróbel, Aleksandra, et al. “The Occurrence of Post-Traumatic Stress Disorder (PTSD) in Patients Hospitalized in Intensive Care Units – a Preliminary Report”. Current Problems of Psychiatry, vol. 14, no. 1, Apr. 2013, pp. 44-52, https://czasopisma.umlub.pl/cpp/article/view/2460.