[1] Kings Coll Hosp NHS Fdn Trust, Inst Liver Studies, London, England
[2] Royal Surrey NHS Fdn Trust, Dept Gastroenterol & Hepatol, Guildford, England
[3] Royal Surrey NHS Fdn Trust, SAS Trace Element Lab, Guildford, England
[4] Royal Surrey NHS Fdn Trust, Berkshire & Surrey Pathol Serv, Guildford, England
[5] Kings Coll Hosp NHS Fdn Trust, Dept Biochem, Synnovis Analyt, London, England
[6] Univ Surrey, Dept Clin & Expt Med, FHMS, Guildford, England
[7] Kings Coll Hosp NHS Fdn Trust, Inst Liver Studies, Denmark Hill, London SE5 9RS, England