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Unfortunately, after publication of this article , it was noticed that the axis numbering of Fig. 4 was switched. The numbering of the x-axis should be on the y-axis and vice versa. The corrected figure can be seen below.
The online version of the original article can be found under doi:10.1186/s12917-016-0709-5.
Milena M. Madry, Email: firstname.lastname@example.org.
Hanspeter Naegeli, Email: email@example.com.