1 Laboratory Hemostasis and Thrombosis, Hematology and Hemotherapy Center, University of Campinas UNICAMP, Campinas, SP, Brazil. Electronic address: silmara@unicamp.br.
2 Laboratory Hemostasis and Thrombosis, Hematology and Hemotherapy Center, University of Campinas UNICAMP, Campinas, SP, Brazil.
3 Department of Clinical Pathology, Faculty of Medical Sciences, University of Campinas, Campinas, SP, Brazil.