After publication of this article [1], an error was reported in the ‘Methods’ section of the article under the subheading ‘DNA extraction and library preparation’. The second primer associated with 926R was incorrectly stated as: “CAAGCAGAAGACGGCATACGAGATGCCGCATTCGATXXXXXXXXXXXXCCGTCAATTCMTTTRAGT”. The correct sequence for the experimental work was: “CAAGCAGAAGACGGCATACGAGAT NNNNNNNNNNNN AGTCAGTCAG CC CCGTCAATTCMTTTRAGT”.