The OPTICA study (Optimised Computed Tomography Pulmonary Angiography in Pregnancy Quality and Safety study): Rationale and design of a prospective trial assessing the quality and safety of an optimised CTPA protocol in pregnancy. - Gillespie, Ciara; Foley, Shane; Rowan, Michael; Ewins, Karl; NiAinle, Fionnuala; MacMahon, Peter (Thrombosis Research, 2019)