1. King’s College London, Institute of Pharmaceutical Science, London SE1 9NH, U.K.
2. Inhalation Sciences Sweden AB, Hälsovägen 7-9, 141 57 Huddinge, Sweden
3. Institute of Environmental Medicine, Karolinska Institutet, 171 77 Stockholm, Sweden
4. Research Centre Pharmaceutical Engineering GmbH, Inffeldgasse 13, Graz 8010, Austria
5. Institute of Process and Particle Engineering, Graz University of Technology, Inffeldgasse 13, Graz, 8010, Austria