Dr. R. J. Khyalappa and Dr. S. M. Thanekar, “CLINICAL UTILITY OF CAT SCORE IN PATIENTS WITH COPD EXACERBATION AND STABLE DISEASE AND ITS CORRELATION WITH PULMONARY FUNCTION TESTS: AN OBSERVATIONAL PROSPECTIVE STUDY”, Med. res. chronicles, vol. 6, no. 1, pp. 40-44, 1.