1. Department of Human Anatomy and Embryology; University Complutense of Madrid; Madrid Spain
2. Universitary Institute of Sanitary Evaluation, University Complutense of Madrid; Madrid Spain
3. Department of Surgery; Rey Juan Carlos University; Madrid Spain
4. Department of Anatomy; René Descartes University; Paris France
5. School of Medicine; University of Wollongong; Australia
6. Department of Surgery; VUmc; Amsterdam Netherlands