Correction: Phylogenetic placement of the enigmatic parasite, Polypodium hydriforme, within the Phylum Cnidaria

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Nathaniel M Evans, Alberto Lindner, Ekaterina V Raikova, Allen G Collins and Paulyn Cartwright^*

BMC Evolutionary Biology 2009, 9:165 doi:10.1186/1471-2148-9-165