1 Faculty of Science and Health, Centre for Computational Intelligence, University of Essex, Colchester CO4 3SQ, UK; National Council of Science and Technology, CICESE-UT3, Research Transfer Unit, Ensenada, Mexico.
2 Costa del Sol Health Agency, Biomedical Research Institute of Malaga, Malaga, Spain.
3 Faculty of Science and Health, Centre for Computational Intelligence, University of Essex, Colchester CO4 3SQ, UK. Electronic address: javier.andreu@essex.ac.uk.