Acknowledgments
We would like to thank the contribution of the students and professors who participated in the study.We would also like to thank to the Visible Human Project (http://vhnet.nlm.nih.gov/) for allowing us to use their medical dataset. This work has been partially supported by the Ministerio de Economía y Competitividad of Spain and the European Union (via ERDF funds) through the research project TIN2011-25259; and by the University of Jaén through the educational innovation projects PID441012 and PID38_201214.