Right-to-left shunt and transcranial Doppler as a diagnostic tool: when and how to run it. Position statement by the Italian society of neurosonology and cerebral haemodynamics. - Miceli G; Trapani S; Cramaro A; Bella R; Cantone M; Limoni P; Marinoni M; Mozzini C; Recchia A; Ricci S; Secone F; Tassi R (Frontiers in neurology, 2025)