Winn Robert A, Chan Edward D, Langmack Esther L, Kotaru Chakradhar, Aronsen Elizabeth
University of Colorado Health Sciences Center, Division of Pulmonary Sciences and Critical Care Medicine, Campus Box C272, 4200 E Ninth Ave, Denver, CO 80262, USA.
Chest. 2004 Nov;126(5):1694-7. doi: 10.1378/chest.126.5.1694.