1. Department of Electronic Engineering, Faculty of Technology; De Montfort University; Leicester LE1 9BH United Kingdom
2. School of Engineering, University of Glasgow; Glasgow G12 8LT United Kingdom
3. Center for Device Thermography and Reliability, H. H. Wills Physics Laboratory; University of Bristol; Tyndall Avenue BS8 1TL United Kingdom
4. School of Engineering and Physical Sciences, University of Aberdeen; Aberdeen AB24 SFX United Kingdom