High levels of healthcare utilization prior to diagnosis in idiopathic pulmonary arterial hypertension support the feasibility of an early diagnosis algorithm: the SPHInX project. - Bergemann R; Allsopp J; Jenner H; Daniels FA; Drage E; Samyshkin Y; Schmitt C; Wood S; Kiely DG; Lawrie A (Pulmonary circulation, 2018)