[1] Rho Inc, Chapel Hill, NC USA
[2] Indiana Hemophilia & Thrombosis Ctr, Indianapolis, IN USA
[3] Univ So Calif, Childrens Hosp Los Angeles, Sch Med, Dept Hematol Oncol, Los Angeles, CA USA
[4] Chinese Univ Hong Kong, Sch Publ Hlth, Hong Kong, Hong Kong, Peoples R China