1 University of Groningen, University Medical Center Groningen, Department of Clinical Pharmacy and Pharmacology, Groningen, Netherlands. Electronic address: j.w.c.alffenaar@umcg.nl.
2 Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University, London, UK; Division of Infection, The Royal London Hospital, Barts Health NHS Trust, London, UK.