| article html file updated | 5 February 2020 12:05 CET | Update | https://www.mdpi.com/1660-3397/7/2/97 |
| article html file updated | 9 May 2019 11:49 CEST | Update | N/A |
| article html file updated | 19 March 2019 18:06 CET | Update | N/A |
| article html file updated | 16 June 2015 06:01 CEST | Update | N/A |
| article html file updated | 6 February 2013 14:55 CET | Update | N/A |
| article html file updated | 5 February 2013 18:55 CET | Update | N/A |
| article html file updated | 28 January 2013 16:43 CET | Update | N/A |
| article html file updated | 25 January 2013 18:38 CET | Update | N/A |
| article html file updated | 21 January 2013 13:13 CET | Update | N/A |
| article html file updated | 17 January 2013 20:33 CET | Original file | N/A |
