Switching from conventional to extrafine aerosol beclomethasone dipropionate therapy in children: a 6-month, open- label, randomized trial.
Szefler SJ, Warner J, Staab D, Wahn U, Le Bourgeois M, van Essen-Zandvliet EE, Arora S, Pedersen S. Switching from conventional to extrafine aerosol beclomethasone dipropionate therapy in children: a 6-month, open- label, randomized trial. J Allergy Clin Immunol. 2002 Jul; 110(1):45-50.