About the Authors
School of Biomedical Sciences, Queen's Medical Centre, University of Nottingham, Nottingham, United Kingdom
Department of Anatomy, Menoufiya University, Shebin El-Koom, Egypt
The authors have declared that no competing interests exist.
Conceived and designed the experiments: LL GB PW. Performed the experiments: LL ME. Analyzed the data: LL. Wrote the paper: LL.