| article html file updated | 8 February 2020 15:14 CET | Update | https://www.mdpi.com/1424-8220/17/9/2021 |
| article html file updated | 3 May 2019 03:45 CEST | Update | - |
| article html file updated | 30 September 2017 14:45 CEST | Update | - |
| article html file updated | 4 September 2017 11:07 CEST | Original file | - |
| article xml uploaded. | 4 September 2017 11:05 CEST | Update | https://www.mdpi.com/1424-8220/17/9/2021/xml |
| article xml uploaded. | 4 September 2017 11:05 CEST | Original file | - |
| article pdf uploaded. | 4 September 2017 11:05 CEST | Version of Record | https://www.mdpi.com/1424-8220/17/9/2021/pdf |
