1. School of Engineering, Robert Gordon University, Aberdeen AB10 7GJ, UK
2. Van OlstBorg, Hanz University of Applied Sciences, Groningen, Zernikeplein 7, 9747 AS Groningen, The Netherlands
3. School of Computing, Engineering & the Built Environment, Merchiston Campus, Edinburgh Napier University, 10 Colinton Road, Edinburgh EH10 5DT, UK