1. School of Industrial Engineering Purdue University West Lafayette IN 47907 USA
2. Flex Laboratory Purdue University West Lafayette IN 47907 USA
3. Department of Applied Physics State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China
4. Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USA
5. Regenstrief Center for Healthcare Engineering West Lafayette IN 47907 USA