1 Pediatric Infectious Diseases Unit, Gregorio Marañón Hospital, Instituto de Investigación Gregorio Marañón, Unidad de Investigación Materno-Infantil Fundación Familia Alonso, Madrid, Spain; CIBER en Enfermedades Infecciosas, Madrid, Spain. Electronic address: david.aguilera@salud.madrid.org.
2 CIBER en Enfermedades Infecciosas, Madrid, Spain; Servicio de Microbiología. Hospital Universitario Ramón y Cajal and Instituto Ramón y Cajal de Investigación Sanitaria, Madrid, Spain; European Committee on Antimicrobial Susceptibility Testing, Växjö, Sweden.
3 Division of Clinical Microbiology, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden; Clinical Microbiology, Karolinska University Hospital, Stockholm, Sweden.
4 European Committee on Antimicrobial Susceptibility Testing Development Laboratory, Växjö, Sweden.
5 Department for Infectious Diseases and Vaccinology and Department for Paediatric Pharmacology, University of Basel Children's Hospital, Basel, Switzerland; Paediatric Infectious Diseases Research Group, Institute for Infection and Immunity, St. George's, University of London, London, UK.
6 Centre for Infectious Diseases, Institute of Medical Microbiology and Hygiene, Saarland University, Homburg, Germany.
7 European Committee on Antimicrobial Susceptibility Testing, Växjö, Sweden; University of Adelaide, Adelaid, South Australia, Australia.