1. Mathematics and Cybernetics , SINTEF Digital, Forskningsveien 1, 0373 Oslo, Norway
2. Division of Applied Mathematics , Brown University, Providence, RI 02912, United States
3. Maxwell Institute for Mathematical Sciences and Department of Actuarial Mathematics and Statistics , Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
4. Department of Mathematics, Technical University of Munich , Boltzmannstraße 3, 80333 Munich, Germany