1. New Zealand Institute for Advanced Study, Massey University at Albany, Auckland, New Zealand
2. Department of Molecular Biology, Umeå University, Umeå, Sweden
3. Santa Fe Institute, New Mexico, United States
4. Department of Mathematics, Umeå University, Umeå, Sweden
5. Department of Microbial Population Biology, Max Planck Institute for Evolutionary Biology, Plön, Germany
6. Ecole Supérieure de Physique et de Chimie Industrielles de la Ville de Paris, ESPCI Paris-Tech, CNRS UMR 8231, PSL Research University, Paris, France