Bhaskar, R. ., Singh, S. ., Singh, P. ., Singh, S. K. ., Gaur, P. S. ., & Pandey, S. . (2017). Measurement of Procalcitonin in acute exacerbation of COPD and its correlation to Spirometric Indices. International Journal of Research and Development in Pharmacy & Life Sciences, 6(6), 2833 - 2839. https://doi.org/10.21276/IJRDPL.2278-0238.2017.6(6).2833-2839