1. Independent, Formerly Department of Morphological Sciences, Faculty of Medical Sciences, National Autonomous University of Leon, Leon, Nicaragua
2. Independent, Formerly Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands
3. Faculty of Education Sciences, Open University, Heerlen, the Netherlands
4. Anatomy Department, University Medical Center Utrecht, Utrecht, the Netherlands
5. Education Center, University Medical Center Utrecht, Utrecht, the Netherlands