1. Department of Anatomy and Cell Biology, Indiana University, Indianapolis, Indiana, USA;
2. Department of Medical Education, Tufts University, Boston, Massachusetts, USA;
3. Department of Anatomy and Cell Biology, George Washington University, Washington DC, USA;
4. Department of Anthropology, George Washington University, Washington DC, USA;
5. Department of Cell Biology and Anatomy, Louisiana State University, New Orleans, Louisiana, USA;
6. Department of Anatomy and Cell Biology, Indiana University, Bloomington, Indiana, USA;
7. Department of Cell and Molecular Medicine, Rush University, Chicago, Illinois, USA