Affiliation: | 1. >North Tees General Hospital, Hardwick, Stockton-on-Tees, Cleveland, TS9 8PE, England;2. University of Cambridge, Department of Clinical Biochemistry, Addenbrooke''s Hospital, Hills Road, Cambridge, CB2 2QR, England;3. The Royal Victoria Infirmary, Queen Victoria Road, Newcastle upon Tyne, NE1 4LP, England |