title: Folkerts and Nijkamp reply.
abstract: Airway epithelium: more than just a source for epithelium-derived relaxing factors!
authors: Utrecht Institute for Pharmaceutical Sciences, Department of Pharmacology and Pathophysiology, PO Box 80082, 3508 TB Utrecht, Utrecht University, The Netherlands.
authors: G
authors: Folkerts
authors: F
authors: Nijkamp