RT Journal Article SR Electronic T1 Penh is not a measure of airway resistance! JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 805 OP 805 DO 10.1183/09031936.00091307 VO 30 IS 4 A1 L. K. A. Lundblad A1 C. G. Irvin A1 Z. Hantos A1 P. Sly A1 W. Mitzner A1 J. H. T. Bates YR 2007 UL http://erj.ersjournals.com/content/30/4/805.1.abstract AB