RT Journal Article SR Electronic T1 Sniff nasal inspiratory pressure: what is the optimal number of sniffs? JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society DO 10.1183/09031936.06.00121305 A1 F. Lofaso A1 F. Nicot A1 M. Lejaille A1 L. Falaize A1 A. Louis A1 A. Clement A1 J-C. Raphael A1 D. Orlikowski A1 B. Fauroux YR 2006 UL http://erj.ersjournals.com/content/early/2006/02/02/09031936.06.00121305.abstract AB