tokens: Plasma was tested before and after ( 14 + /- 7.5 [ SD ] days ) surgery for IgG antibodies to the complex of heparin / platelet factor 4 , using a standardized , validated enzyme linked immunosorbent assay ( ELISA ) .
folded_tokens: plasma be test before and after ( 14 + /- 7.5 [ sd ] day ) surgery for igg antibody to the complex of heparin / platelet factor 4 , use a standardized , validated enzyme link immunosorbent assay ( elisa ) .