1. Institute of Pharmaceutics and Biopharmaceutics, Heinrich-Heine-University, Düsseldorf, Germany;
2. Institute of Electrical Engineering and Information Technology, Christian-Albrechts-University, Kiel, Germany;
3. Döscher Microwave Systems GmbH, Hamburg, Germany;
4. L.B. Bohle Maschinen + Verfahren GmbH, Ennigerloh, Germany