title: Retraction: 'Number needed to treat with 4-factor prothrombin complex concentrate for urgent warfarin reversal' by Andrew Chua, Vishal Patel, Allison Perrin, Lee Stern, Jenifer Ehreth, Laurel Omert, Christopher Hood, Julie Farley, Michael McGlynn and Liping Huang.
abstract: The above abstract from the THSNA 2016 Summit Abstract Proceedings, first published online in the American Journal of Hematology on 20 July 2016 in Wiley OnlineLibrary (www.onlinelibrary.wiley.com), and in Volume 91, Issue 9, p. E427, has been retracted by agreement between the authors, the journal Editor-in-Chief, Carlo Brugnara, and Wiley Periodicals, Inc. The retraction has been agreed due to concerns from the submitting authors that the abstract was inadvertently submitted prior to receiving approval from all authors and proper review of data analytics, thereby rendering it incomplete.
  
  
  
  THSNA 2016 Summit Abstract Proceedings (2016). Am. J. Hematol., 91: E427. https://doi.org/10.1002/ajh.24471.