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| article pdf uploaded. | 22 January 2019 11:22 CET | Updated version of record | https://www.mdpi.com/1424-8220/19/2/404/pdf |
| article xml uploaded. | 22 January 2019 11:22 CET | Update | https://www.mdpi.com/1424-8220/19/2/404/xml |
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| article pdf uploaded. | 19 January 2019 11:57 CET | Version of Record | https://www.mdpi.com/1424-8220/19/2/404/pdf-vor |
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