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. 2018 Aug 9;15(8):1699. doi: 10.3390/ijerph15081699

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© 2018 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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Surface cleaning. (a) Various types of surfaces with a cleaning frequency of 0.5 h−1; (b) different clean interval for top five high-touch surfaces ¹. ¹ Top five high-touch surfaces: desktop, mouse, mobile phone, keyboard and chair arms.