High levels of healthcare utilization prior to diagnosis in idiopathic pulmonary arterial hypertension support the feasibility of an early diagnosis algorithm: the SPHInX project oleh Rito Bergemann, James Allsopp, Harvey Jenner, Flora Ashley Daniels, Edmund Drage, Yevgeniy Samyshkin, Claude Schmitt, Steven Wood, David G. Kiely, Allan Lawrie