1. Fraunhofer FIRST, Kekuléstrasse 7, 12489 Berlin, Germany, Department of Computer Science, Technische Universität Berlin, Franklinstrasse 28/29, 10587 Berlin, Germany, idalab GmbH, Sophienstrasse 24, 10178 Berlin, Germany, and Research Laboratories of Bayer Schering Pharma AG, Müllerstrasse 178, 13342 Berlin, Germany