1 Division of Clinical Epidemiology, Department of Clinical Research, University Hospital Basel and University of Basel, Basel, Switzerland; Paediatric Research Center, University Children's Hospital Basel (UKBB), Basel, Switzerland. Electronic address: soheila.aghlmandi@ukbb.ch.
2 Infectious Diseases and Paediatric Research Centre University of Basel Children's Hospital and University of Basel, Basel, Switzerland; Centre for Neonatal and Paediatric Infection, St. George's University, London, UK.
3 Division of Clinical Epidemiology, Department of Clinical Research, University Hospital Basel and University of Basel, Basel, Switzerland.