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Severity of Illness Index
Whittaker, H. ., Rubino, A. ., Mullerova, H. ., Morris, T. ., Varghese, P. ., Xu, Y. ., … Quint, J. K. (2022). Frequency and Severity of Exacerbations of COPD Associated with Future Risk of Exacerbations and Mortality: A UK Routine Health Care Data Study. Int J Chron Obstruct Pulmon Dis, 17, 427–437. http://doi.org/10.2147/copd.s346591