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In the print version of this article and the version initially published online, an author name was omitted. The fourth author should have been listed as Olivier De Backer of the Molecular Physiology Research Unit, University of Namur Medical School, 61, rue de Bruxelles, B5000 Namur, Belgium. The error has been corrected in the HTML and PDF versions of the article. This correction has been appended to the PDF version. The authors regret the error.