PT  - JOURNAL ARTICLE
AU  - L. Freitag
AU  - A. Ernst
AU  - M. Unger
AU  - K. Kovitz
AU  - C.H. Marquette
TI  - A Proposed classification system of central airway stenosis
AID  - 10.1183/09031936.00132804
DP  - 2007 Mar 28
TA  - European Respiratory Journal
4099  - http://erj.ersjournals.com/content/early/2007/03/28/09031936.00132804.short
4100  - http://erj.ersjournals.com/content/early/2007/03/28/09031936.00132804.full