Effect of uvulopalatopharyngoplasty on upper airway collapsibility in obstructive sleep apnea. - Schwartz,A.R.; Schubert,N.; Rothman,W.; Godley,F.; Marsh,B.; Eisele,D.; Nadeau,J.; Permutt,L.; Gleadhill,I.; Smith,P.L. (Am Rev Respir Dis, 1992)