Acknowledgement
This study was supported by Institute for Information & communications Technology Promotion (IITP) grant funded by the Korea government (MSIT) (2017-0-00050, Development of Human Enhancement Technology for auditory and muscle support) and by a grant from the NRF (NRF-2016R1A6A3A11930931 and NRF-2018R1D1A1B07042870), which is funded by the Korean government.
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