1. Effect of positive expiratory pressure breathing in patients with cystic fibrosis. Issue 4 (April 1991) Authors: van der Schans, C P; van der Mark, T W; de Vries, G; Piers, D A; Beekhuis, H; Dankert-Roelse, J E; Postma, D S; Koëter, G H Journal: Thorax Issue: Volume 46:Issue 4(1991) Page Start: 252 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗