1. Robert-Koch-Institute, Seestraße 10, 13353 Berlin, Germany.
2. Institute for Theoretical Biology, Humboldt-University Berlin, Invalidenstraße 42, 10115 Berlin, Germany.
3. Department of Engineering Sciences and Applied Mathematics and Northwestern Institute on Complex Systems, Northwestern University, Evanston, IL 60208, USA.
4. ETH Zurich, Swiss Federal Institute of Technology, CLU E1, Clausiusstraße 50, 8092 Zurich, Switzerland.
5. Risk Center, ETH Zurich, Scheuchzerstraße 7, 8092 Zurich, Switzerland.