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The aim and procedure of the experiment were explained to the participants in detail both in writing and orally. We told the participants that the participation in the experiment was voluntary, and they could cancel the experiment at any time. In conducting the experiment, a physician and a nurse were on site, if any change in physical condition was observed to the participant, the experiment was stopped immediately and a system was in place to deal with the change. All participants provided written informed consent.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"Hitomi Suzuki, Hiroji Tsujimura, Teruyo Kitahara and Kazushi Taoda declare that they have no competing interests. Yumi OGURA and Etsunori FUJITA are employees of Delta Tooling Co., LTD. The seatback with a built-in air-pack sensor in this experiment was loaned to us free of charge by the company.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"126"}}