Artikel 2011
Inhaler device selection: Special considerations in elderly patients with chronic obstructive pulmonary disease
Barrons et al.
American Journal of Health-System Pharmacy July 1, 2011 vol. 68 no. 13 1221-1232
Inhaler mishandling remains common in real life and is associated with reduced disease control 
Melani et al.
Respir Med. (2011) Jun;105(6):930-938. Epub 2011 Mar 2
