Tracheostomy in intensive care unit patients can be performed without bleeding complications in case of normal thromboelastometry results (EXTEM CT) despite increased PT-INR: a prospective pilot study - Durila, M; Lukáš, P; Astraverkhava, M; Beroušek, J; Zábrodský, M; Vymazal, T (BMC Anesthesiol, 2015)