Erratum. "Similar hypercoagulable state and thrombosis risk in type I and type III protein S-deficient individuals from mixed type I/III families" by Castoldi E, Maurissen LF, Tormene D, Spiezia L, Gavasso S, Radu C, Hackeng TM, Rosing J, Simioni P. Haematologica. 2010 Apr 7. [Epub ahead of print] with doi:10.3324/haematol.2009.021923.