Anti-prothrombin (aPT) and anti-phosphatidylserine/prothrombin (aPS/PT) antibodies and the risk of thrombosis in the antiphospholipid syndrome. A systematic review - Sciascia, S; Sanna, G; Murru, V; Roccatello, D; Khamashta, M A; Bertolaccini, M L (Thromb Haemost, 2014)