False‐positive lupus anticoagulant results by DRVVT in the presence of rivaroxaban even at low plasma concentrations. (29th May 2018) - Martinuzzo, M. E.; Forastiero, R.; Duboscq, C.; Barrera, L. H.; López, M. S.; Ceresetto, J.; Penchasky, D.; Oyhamburu, J.