1. Weldon School of Biomedical Engineering, Purdue University , West Lafayette, IN 47907 , USA
2. Elmore Family School of Electrical and Computer Engineering , West Lafayette, IN 47907 , USA
3. School of Materials Engineering, Purdue University , West Lafayette, IN 47907 , USA
4. School of Mechanical Engineering, Hanyang University , Seoul 04763 , Republic of Korea
5. Department of Speech, Language and Hearing Sciences, Indiana University , Bloomington, IN 47408 , USA
6. Center for Implantable Devices, Purdue University , West Lafayette, IN 47907 , USA
7. School of Mechanical Engineering, Purdue University , West Lafayette, IN 47907 , USA