1. Department of Biochemistry and Molecular & Cellular Biology Georgetown University School of Medicine, Georgetown University Washington DC USA
2. Division of Anatomy, Department of Biomedical Education and Anatomy, College of Medicine The Ohio State University Columbus Ohio USA
3. Anatomy Learning Institute, College of Health Sciences Point Loma Nazarene University San Diego California USA
4. Division of Anatomy, Department of Surgery, School of Medicine University of California at San Diego San Diego California USA