I would like to want to know how to obtain the permission to use for one / all of the following Comorbidity Scores?

If you know the contact e-mail or the respective on-line page. Thank you!

Charlson Comorbidity Index (CCI)

Elixhauser Comorbidity Index – Total Score (ETS) / Point System (EPS)

Functional Comorbidity Index (FCI)

Comorbidity Count COUNT

Rheumatic Disease Comorbidity Index (RDCI)

Psoriatic arthritis comorbidity index (PsACI)

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