http://www.ncbi.nlm.nih.gov/pubmed/10511234
http://pghelper.org/forum.php?mod=attachment&aid=MTV8MjIxMGVkNGN8MTQxMDU0OTgyMHwxMDA0fDkxMA%3D%3D
http://pghelper.org/forum.php?mod=attachment&aid=MTV8MjIxMGVkNGN8MTQxMDU0OTgyMHwxMDA0fDkxMA%3D%3D
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