1. Distributed Information and Automation Laboratory, Institute for Manufacturing, Department of Engineering, University of Cambridge, Cambridge CB3 0FS, UK
2. Complexity Sciences Center, National Autonomous University of México, Circuito Centro Cultural S/N, Ciudad Universitaria, Coyoacán 04510, Ciudad de México, Mexico
3. Bioinformatics and Biomedical Signals Laboratory, Biomedical Engineering Research Center, School of Industrial Engineering, Universitat Politècnica de Catalunya, H Building, 4th Floor, Av. Diagonal, 647, Barcelona 08028, Catalunya, Spain
4. Santa Fe Institute, 1399 Hyde Park Rd., Santa Fe, NM 87501, USA