Srirat, C., Hanucharurnkul, S., Aree-Ue, S., & Junda, T. (2015). Similarity and Stability of Symptom Cluster in Severity and Distress among Persons with Chronic Obstructive Pulmonary Disease. Pacific Rim International Journal of Nursing Research, 19(2), 89–106. Retrieved from https://he02.tci-thaijo.org/index.php/PRIJNR/article/view/22473