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Schmidt, SAJ and Langan, S (2019). Clinical Code List - Charlson Comorbidity - OPCS Codes. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00001234.
Schmidt, SAJ and Langan, S (2018). Clinical code list - OPCS Charlson Comorbidity codes. [Data Collection]. London School of Hygiene & Tropical Medicine, London, United Kingdom. https://doi.org/10.17037/DATA.00000987.