• Cholecystectomy and Diagnosis-Related Groups (DRGs): Patient classification and hospital reimbursement in 11 European countriesPaat-Ahi, Gerli; Aaviksoo, Ain; Świderek, MariaInternational journal of health policy and management2014 / p. 383-391 : ill https://doi.org/10.15171/ijhpm.2014.121 https://www.scopus.com/sourceid/21100787828 https://www.scopus.com/record/display.uri?eid=2-s2.0-85002412606&origin=inward&txGid=d09852d4366f554d5dcbf24c4a2b32af