Proposal for standardized preanalytical and analytical conditions for measuring thrombin generation in hemophilia: communication from the SSC of the ISTH - Dargaud, Y; Wolberg, A S; Gray, E; Negrier, C; Hemker, H C; Subcommittee on Factor VIII, Factor IX, and Rare Coagulation Disorders (J Thromb Haemost, 2017)