Retraction Notice

This article [1] has been retracted by the authors because it contains large portions of text that were duplicated from a number of pervious publications including Chapple et al. [2], Untergasser et al. [3] and Mariotto et al. [4]. The authors apologise for failing to cite these articles.

Notes

The online version of the original article can be found at 10.1186/1471-2482-12-S1-S22.