Delphin Amdal, Cecilie, et al. “Patient-Reported Outcomes Evaluating Palliative Radiotherapy and Chemotherapy in Patients With Oesophageal Cancer: A Systematic Review”. Acta Oncologica, vol. 52, no. 4, May 2013, pp. 679-90, doi:10.3109/0284186X.2012.731521.