1University of California San Diego, Hemophilia and Thrombosis Treatment Center, San Diego, CA, USA;
2British Columbia Provincial Bleeding Disorders Program-Adult Division, Vancouver, Canada;
3Orthopaedic Hospital Los Angeles, Orthopaedic Institute for Children, University of California Los Angeles, Los Angeles, CA, USA;
4University of California San Diego, Hemophilia and Thrombosis Treatment Center, San Diego, CA, USA; and
5The Scripps Research Institute, Department of Molecular and Experimental Medicine, La Jolla,CA, USA, San Diego, CA, USA