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. 2020 Feb 24;17(4):1445. doi: 10.3390/ijerph17041445

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Head and body motions during close contact by posture of the two students: (a) Sitting-sitting; (b) Standing-standing; (c) Sitting-standing. (The circle shows the face orientation of the student; see Figure 4a).

Head and body motions during close contact by posture of the two students: (a) Sitting-sitting; (b) Standing-standing; (c) Sitting-standing. (The circle shows the face orientation of the student; see Figure 4a).