American Review of Respiratory Disease | November 7, 2015 | Volume: 116 | Issue: 3 | Pages: 399-402
American Review of Respiratory Disease | April 4, 2013 | Volume: 141 | Issue: 5_Part_1 | Pages: 1093-1094
Circulation | June 11, 2012 | Volume: 14 | Issue: 3 | Pages: 349-364
10.1161/01.cir.14.3.349 | PMID 13365046