1. Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich 8093, Switzerland
2. Department of Mathematics, Imperial College London, London SW7 2AZ, United Kingdom
3. Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, United Kingdom
4. Abraham de Moivre-CNRS IRL, Imperial College London, London SW7 2AZ, United Kingdom