**Author details**

#### Nora Hofer

*Research Unit for Neonatal Infectious Diseases and Epidemiology, Medical University of Graz, Austria* 

#### Wilhelm Müller

*Division of Neonatology, Department of Pediatrics and Adolescent Medicine, Medical University of Graz, Austria* 

Bernhard Resch *Research Unit for Neonatal Infectious Diseases and Epidemiology, Medical University of Graz, Austria Division of Neonatology, Department of Pediatrics and Adolescent Medicine, Medical University of Graz, Austria* 
