Pre-publication versions of this article and reviewers' reports
| Original Submission - Version 1 | Manuscript | 30 Aug 2013 | |
| Resubmission - Version 2 | Manuscript | 06 Sep 2013 | |
| Resubmission - Version 3 | Manuscript | 06 Sep 2013 | |
| Editorial acceptance | 06 Sep 2013 | ||
| Published | 12 Sep 2013 |


