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Collins, D. (2003). Pretesting survey instruments: An overview of cognitive instruments. Quality of Life Research, 12(3), 229–238. Retrieved from https://link.springer.com/article/10.1023%2FA%3A1023254226592
Mills, M., Davies, H. T. O., & Macrae, W. A. (1994). Care of dying patients in hospital. British Medical Journal, 309, 583–586. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2541738/