1. van’t Hoff Institute for Molecular Sciences, University of Amsterdam, P.O. Box 94157, 1090 GD Amsterdam, The Netherlands
2. Computational and Systems Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, New York 10065, United States
3. Department of Mathematics and Computer Science, Arnimallee 6, Freie Universität Berlin, 14195 Berlin, Germany