T. Khamboon, K. Pongthavornkamol, K. Olson, D. Wattanakitkrileart, C. Viwatwongkasem, and W. Lausoontornsiri, “Symptom Experiences and Symptom Cluster across Dimensions in Thais with Advanced Lung Cancer”, PRIJNR, vol. 19, no. 4, pp. 330–344, Nov. 2015.