"The corresponding and the first author (Melike Cengiz) and the journal wish to retract the December 2011 original article entitled Effects of Nattokinase on Whole Blood Viscosity and Mortality. This decision was based on the information provided by Oğuz Kerim Baştürk, one of the senior authors of this manuscript, which is now confirmed by the other authors of the manuscript. Based on this information the list of authors of this manuscript does not represent the actual contribution of the authors to the preparation of the paper. The corresponding author requests retraction of the paper in its entirety and apologizes to the reviewers, editors, and readers of Journal of the Turkish Society of Intensive Care for any adverse consequences that may have resulted from the paper’s publication."