Sniff nasal inspiratory pressure: what is the optimal number of sniffs?
F. Lofaso, F. Nicot, M. Lejaille, L. Falaize, A. Louis, A. Clement, J-C. Raphael, D. Orlikowski, B. Fauroux
European Respiratory Journal May 2006, 27 (5) 980-982; DOI: 10.1183/09031936.06.00121305