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Upon publication of the original article , the authors noticed that the figure labelling for Fig. 4 in the online version was processed wrong. The top left panel should be panel a, with the panels to its right being b and c. d and e should be the panels on the lower row, and f is correct. The graphs themselves are all correct. It is simply the letter labels that are wrong. The panel labels should be a, b, c, d, e, f and not e, d, c, b, a, f.
The corrected Fig. Fig.44 is given in this erratum.
The original article can be found online at https://doi.org/10.1186/1750-0680-9-2.