2003, The Self-Administered Comorbidity Questionnaire: a new method to assess comorbidity for clinical and health services research

Sangha O, Stucki G, Liang MH, Fossel AH, Katz JN.

Arthritis Rheum. 2003 Apr 15;49(2):156-63

https://www.ncbi.nlm.nih.gov/pubmed/12687505