1. Unite d'Hemostase Clinique; Hopital Edouard Herriot; Universite Lyon 1; Lyon France
2. Durham Veterans Affairs Medical Center; Duke University; Durham NC USA
3. University of North Carolina Medical Center; Chapel Hill NC USA
4. Department of Biostatistics; University of North Carolina at Chapel Hill; Chapel Hill NC USA
5. Service d'Urgences Médicales N1; Hopital Edouard Herriot; Lyon France