1 Department of Microbiology, Tumor and Cell Biology, Karolinska Institute, Stockholm, Sweden.
2 Department of Paediatrics, County Council of Östergötland, Norrköping, Sweden.
3 Division of Paediatrics, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
4 Department of Paediatrics, County Council of Östergötland, Norrköping, Sweden. larsstenhammar@yahoo.com.
5 Division of Paediatrics, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden. larsstenhammar@yahoo.com.
6 Division of Medical Microbiology, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden.