| article html file updated | 9 February 2020 07:19 CET | Update | https://www.mdpi.com/2313-433X/4/2/44 |
| article html file updated | 30 September 2019 23:20 CEST | Update | - |
| article html file updated | 1 May 2019 16:58 CEST | Update | - |
| article html file updated | 17 April 2019 16:22 CEST | Update | - |
| article html file updated | 29 March 2019 00:47 CET | Update | - |
| article html file updated | 14 March 2018 11:55 CET | Update | - |
| article html file updated | 23 February 2018 04:50 CET | Original file | - |
| article xml uploaded. | 23 February 2018 04:49 CET | Original file | https://www.mdpi.com/2313-433X/4/2/44/xml |
| article pdf uploaded. | 23 February 2018 04:49 CET | Version of Record | https://www.mdpi.com/2313-433X/4/2/44/pdf |
