Erratum to: SpringerPlus (2016) 5:892 DOI 10.1186/s40064-016-2592-8

Upon publication of the original article (Derbie et al. 2016), it was noticed that Berhanu Elfu’s name was incorrectly written as ‘Bihanu Elfu’. This has now been corrected in this erratum and updated in the original article.