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Publisher's Note: Reference wrong

Posted by jocalynclark on 26 Apr 2012 at 18:04 GMT

[6]).
http://plosmedicine.org/article/info:doi/10.1371/journal.pmed.1001210#article1.body1.sec1.p3

The sentence ending "... small gifts invoke obligations to reciprocate.)" should end with reference [7].

Competing interests declared: I am Senior Magazine Editor, PLoS Medicine.