抄録
This article has been retracted at the request of all authors. This original article is a duplicated article which was previously published in Rigakuryouhoukagaku (Y. Nanba et al., Rigakuryouhoukagaku 29 (5): 799-803). In accordance with policies and procedures governing academic publication we concluded that the above-mentioned article published in J. Phys. Ther. Sci. be retracted. We apologize to readers of the journal that this was not detected during the submission and reviewing process.