1. Department of Medicine, Karolinska Institutet at Karolinska University Hospital, Stockholm, Sweden;
2. Institute for Theoretical Biology, Humboldt University Berlin and Charité, Berlin, Germany;
3. Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden;
4. Department of Mathematics, Stockholm University, Stockholm, Sweden;
5. Institut Camille Jordan, University of Lyon, Villeurbanne, France.