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. 2017 Apr 13;17:39. doi: 10.1186/s12911-017-0442-4

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Variables were calculated in time periods of t ₁ - t ₄, when t _s - t _e is the time period of home care for a customer. Figure shows time scale of starting day and ending day of home care for customer i from which the variables of the models were derived