1. Maxwell Institute for Mathematical Sciences, Department of Mathematics, Heriot-Watt University, Edinburgh EH14 4AS,
United Kingdom
2. Institute for Infrastructure and Environment, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
3. Centre for Global Health, Usher Institute, College of Medicine and Veterinary Medicine, University of Edinburgh, Edinburgh
EH8 9AG, United Kingdom
4. School of Engineering, University of Edinburgh, Edinburgh EH9 3FB, United Kingdom