1. Department of Mechanical Engineering and Materials Science, Duke University, NC 27708, USA.
2. Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA 16801, USA.
3. Department of Biomedical Engineering, Duke University, NC 27708, USA.
4. Alfred E. Mann Institute for Biomedical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
5. Department of Obstetrics, Gynecology, and Reproductive Sciences, Magee-Womens Research Institute, University of Pittsburgh, Pittsburgh, PA 15213, USA.
6. School of Dentistry and the Departments of Otolaryngology/Head and Neck Surgery and Pathology, University of California, Los Angeles, Los Angeles, CA 90095, USA.
7. School of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA.