1. Department of Paediatrics; Östersund Hospital; Östersund Sweden
2. Department of Clinical Sciences, Skåne University Hospital; Lund University/CRC; Malmö Sweden
3. Department of Oncology and Cancer Epidemiology Clinical Sciences; Lund University; Lund Sweden
4. Section of Clinical Microbiology, Department of Medical Sciences; Uppsala University; Uppsala Sweden
5. Deutsches Krebsforschungszentrum; Heidelberg Germany