1. Department of Mathematics, Duke University, Durham, North Carolina;
2. Department of Physiology, Augusta University, Augusta, Georgia;
3. Sorbonne Universités, UPMC University Paris 06, Université Paris Descartes, Sorbonne Paris, France;
4. INSERM UMRS 1138, CNRS ERL 8228, Centre de Recherche des Cordeliers, Paris, France; and
5. Department of Biomedical Engineering, Boston University, Boston, Massachusetts