[1] Dept Invest & Docencia, Caracas, Venezuela
[2] Natl Hemophilia Ctr Venezuela Banco Municipal San, Caracas, Venezuela
[3] Lab Hemostasia Banco Municipal Sangre DC, Caracas, Venezuela
[4] Hosp Rafael Tobias, Barcelona, Venezuela
[5] Hosp Cent San Felipe, San Felipe, Estado Yaracuy, Venezuela