[1] Freeman Rd Hosp, Dept Hepatobiliary Pancreat & Transplant Surg, Newcastle Upon Tyne NE7 7DN, Tyne & Wear, England
[2] Royal Victoria Infirm, Dept Infect & Trop Med, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England
[3] Royal Victoria Infirm, Dept Microbiol, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England