1. Medical Microbiology, NHS Lothian, Royal Infirmary of Edinburgh, Edinburgh, UK
2. Present address: Medical Microbiology, NHS Tayside, Ninewells Hospital, Dundee, UK
3. Medical Microbiology, NHS Grampian, Aberdeen Royal Infirmary, Aberdeen, UK
4. Scottish Microbiology and Virology Network, NHS Grampian, Aberdeen Royal Infirmary, Aberdeen, UK