ePLAR - The echocardiographic Pulmonary to Left Atrial Ratio - A novel non-invasive parameter to differentiate pre-capillary and post-capillary pulmonary hypertension. - Scalia GM; Scalia IG; Kierle R; Beaumont R; Cross DB; Feenstra J; Burstow DJ; Fitzgerald BT; Platts DG (International journal of cardiology, 2016)