1. Department of Pediatrics, Pharmacia Diagnostics AB. Uppsala, Sweden
2. Borås Hospital, Borås. Länssjukhuset Ryhov Pharmacia Diagnostics AB. Uppsala, Sweden
3. Jönköping, Kärnsjukhuset, Skövde, Pharmacia Diagnostics AB. Uppsala, Sweden
4. Department of Medical Microbiology, University of' Turku, Finland Pharmacia Diagnostics AB. Uppsala, Sweden
5. Department of Clinical Research, Pharmacia Diagnostics AB. Uppsala, Sweden