Sankaranarayanan Viji, Zeidalski Tomasz M, Chitkara Rajinder K
Division of Pulmonary and Critical Care Medicine, Stanford University Medical Center and Medical Services, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA.
Chest. 2005 Jun;127(6):2266-70. doi: 10.1378/chest.127.6.2266.