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Since publication of their article , the authors reported that a requested proof correction had not been carried out in the final published version. The authors had asked for Figure Numbers 2 and 3 to be swapped, and the published version should reflect this.
The original article has been corrected.
The online version of the original article can be found under doi:10.1186/s40168-017-0277-3
Ashwani Kumar, Email: ni.ser.hcetmi@kinawhsa.