- Received February 17, 2015.
- Accepted April 9, 2015.
- Published online May 6, 2015.
Copyright & Usage
© 2015 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
- 1School of Electronic Engineering and Computer Science, Queen Mary University of London, London E1 4NS, UK
- 2Division of Life Sciences, Imperial College London, London SW7 2AZ, UK
- 3Last.fm, 5-11 Lavingdon Street, London SE1 0NZ, UK