1. Institute of Stochastics, Karlsruhe Institute of Technology (KIT) , Englerstraße 2, 76131 Karlsruhe, Germany.
2. Department of Mathematics, University of Kaiserslautern , Erwin-Schrödinger Straße, 67663 Kaiserslautern, Germany.
3. Liberty Life: Libfin Markets, Claremont Central , Claremont, Cape Town, 7735 South Africa.
4. Institute for Mathematics, University of Oldenburg , P.O. Box 2503 26111 Oldenburg, Germany.
5. Department IV—Mathematics, University of Trier , Universitätsring 19, 54296 Trier, Germany.