* Adapted from Erzingerat al. J Aerosol Med 2007 20 (Suppl1 S78-S84)
**Quantifying facemask sealing efficiency when used on a valved holding chamber during simulated breathing. D von Hollen, E Lieberman, K Nikander, Philips Respironics, Respiratory Drug Delivery, Parsippany, NJ, USA. Presented at the Association of Asthma Educators (AAE) annual conference, 3 July
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