found: Work cat.: Boehning, Corey J. Seasonal comparison of low-risk community-acquired pneumonia patients using the Pneumonia Severity Index, 2005:p. iv (Pneumonia Severity Index (PSI))
found: Stanton, Mark W. Improving treatment decisions for patients with community-acquired pneumonia, 2002:p. 1 (Pneumonia Severity Index (PSI))
found: Davydov, L., et al. "Prospective evaluation of the treatment and outcome of community-acquired pneumonia according to the Pneumonia Severity Index in VHA hospitals," Diagn Microbiol Infect Dis, Feb. 6, 2006.
found: Dictionary of Medical Acronyms & Abbreviations, 5th ed., 2005, via STAT!Ref, Mar. 14, 2006(PSI, pneumonia severity index)