1. Merck Serono SA, Corsier-sur-Vevey, Biotech Process Sciences, Zone Industrielle B; CH-1809 Fenil-sur-Corsier Switzerland
2. Dept. of Biotechnology and Biophysics; Julius-Maximilians-Universität Würzburg, Biozentrum; Am Hubland DE-97074 Würzburg Germany
3. Inst. for Biochemical Engineering and Analytics; University of Applied Sciences Giessen; Wiesenstrasse 14, DE-35390 Giessen Germany