Applying a direct aPTT ratio (PlatelinLS/ActinFS) permits to identify rapidly and reliably a bleeding-related factor deficiency or a lupus anticoagulant sequential to an isolated prolongation of aPTT in paediatric pre-operative screening - Li, R; Swaelens, C; Vandermijnsbrugge, F; Cantinieaux, B (Eur J Haematol, 2016)