Can, G., & Aydiner, A. (2011). Development and validation of the Nightingale Symptom Assessment Scale (N-SAS) and predictors of the quality of life of the cancer patients in Turkey. European journal of oncology nursing : the official journal of European Oncology Nursing Society, 15(1), 3–11. https://doi.org/10.1016/j.ejon.2009.10.010