1. Centre for Advanced Spatial Analysis, University College London, London, UK
2. Information Systems group, Department of Law and Economics, Technical University of Darmstadt, Darmstadt, Germany
3. Engineering Science, Faculty of Engineering, University of Auckland, New Zealand
4. Epidemiology and Biostatistics, Faculty of Medical and Health Sciences, University of Auckland, New Zealand
5. Statistics, Faculty of Science, University of Auckland, New Zealand
6. School of Engineering, Newcastle University, Newcastle upon Tyne, UK