1. Department of Haematology and Bone Marrow Transplantation; Royal Manchester Children's Hospital; Manchester UK
2. Division of Molecular Microbiology; Children's Cancer Research Institute; Vienna Austria
3. Paediatric Hematology-Oncology; Azienda Ospedaliera Universitaria Integrata Verona; Verona Italy
4. Division of Infectious Diseases; University of Genoa (DISSAL) and Ospedale Policlinico San Martino; Genoa Italy
5. Department of Paediatric Haematology and Oncology, Collegium Medicum; Nicolaus Copernicus University Torun; Bydgoszcz Poland
6. Department of Pediatrics; Medical University of Vienna; Vienna Austria