1. Physics Department; San Diego State University; San Diego California USA
2. Muscle Imaging and Modeling Lab; Department of Radiology; University of California; San Diego California USA
3. Department of Human Science; Kanagawa University; Kanagawa Japan
4. Imaging Processing Research Team, Center for Advanced Photonics, RIKEN; Saitama Japan
5. Robot Sensor Systems Research Team, RIKEN-TRI Collaboration Center for Human-Interactive Robot Research; Nagoya Japan