Erratum to: Robomech J (2016) 3:22 DOI 10.1186/s40648-016-0057-z
Unfortunately, the original version of this article  contained an error. The acknowledgements section was included incorrectly. The correct acknowledgements section can be found below.
This work was supported by the MEXT-Supported Program for the Strategic Research Foundation at Private Universities, S1311038.