| article html file updated | 5 February 2020 19:27 CET | Update | https://www.mdpi.com/1660-3397/10/2/451 |
| article html file updated | 8 May 2019 20:18 CEST | Update | - |
| article html file updated | 25 March 2019 09:24 CET | Update | - |
| article html file updated | 16 June 2015 21:47 CEST | Update | - |
| article html file updated | 7 February 2013 10:32 CET | Update | - |
| article html file updated | 7 February 2013 00:45 CET | Update | - |
| article html file updated | 6 February 2013 06:06 CET | Update | - |
| article html file updated | 29 January 2013 01:46 CET | Update | - |
| article html file updated | 26 January 2013 08:13 CET | Update | - |
| article html file updated | 23 January 2013 10:12 CET | Original file | - |