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Implement CCI codes from
Implement codes from: https://www.dovepress.com/adaptation-of-the-charlson-comorbidity-index-for-register-based-resear-peer-reviewed-fulltext-article-CLEP
See also: https://github.com/bjoroeKI/Charlson-comorbidity-index-revisited/blob/main/Charlson_R
Needed the ICD-10 version so implemented that, although not the ICD7 or ICD-9 versions.