[1] Univ Fed Rio de Janeiro, Ctr Ciencias Saude, Dept Bioquim Med, BR-21941590 Rio De Janeiro, Brazil
[2] Univ Hosp, Lab Tecido Conjunt, BR-21941590 Rio De Janeiro, Brazil
[3] Univ Fed Rio de Janeiro, Dept Bioquim Med, Ctr Nacl Ressonancia Magnet Nucl Macromol, BR-21941590 Rio De Janeiro, Brazil
[4] Natl Inst Biol Stand & Controls, Potters Bar EN6 3QG, Herts, England
[5] Washington Univ, Sch Med, Dept Internal Med, Div Hematol, St Louis, MO 63110 USA