1. Department of Paediatrics, Turku University Central Hospital, SF-20520, Turku, Finland
2. Department of Medical Microbiology, University of Turku, SF-20520, Turku, Finland
3. Department of Clinical Microbiology, Turku University Central Hospital, SF-20520, Turku, Finland
4. Department of Obstetrics and Gynecology, Turku University Central Hospital, SF-20520, Turku, Finland