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Publisher's Note: Amendment to Acknowledgements

Posted by catherine_deeprose on 10 Jan 2009 at 03:11 GMT

The authors would like to thank Mike Berger and Corin Bourne for thoughtful discussion.
http://plosone.org/article/info:doi/10.1371/journal.pone.0004153#article1.back1.ack1.p1

The authors would like to thank Mike Berger and Corin Bourne for thoughtful discussion and thank Alan Slater for graphics.