Measurement of Total and Free Cefiderocol Concentrations in Human Plasma by UHPLC-MS/MS: Application to Patients With Difficult-To-Treat Gram-Negative Bacterial Infections - Rigo-Bonnin, Raul; El Haj, Cristina; Benavent, Eva; Poblet-Florentin, Judith; Pons-Oltra, Paula; Esteban, Jaime; Murillo, Oscar (JOURNAL OF SEPARATION SCIENCE, 2025)