[1] Royal Free Hosp, Royal Free Unit Endoscopy, London, England
[2] UCL, Inst Liver & Digest Hlth, London, England
[3] Addenbrookes Hosp, Cambridge, England
[4] Thomayers Hosp, Prague, Czech Republic
[5] Univ Hosp Erlangen, Erlangen, Germany
[6] Ipswich Hosp, Ipswich, Suffolk, England
[7] Worcestershire Acute Hosp, Worcester, England
[8] Univ Hosp Ghent, Ghent, Belgium
[9] Glasgow Royal Infirm, Dept Gastroenterol, Glasgow, Lanark, Scotland
[10] Gloucestershire Royal Hosp, Gloucester, England
[11] Univ Hosp Derby, Derby, England
[12] Univ Hosp Burton, Derby, England
[13] Sandwell & West Birmingham Hosp, West Bromwich, W Midlands, England
[14] Univ Hosp Birmingham, Birmingham, W Midlands, England
[15] Maidstone & Tunbridge Wells Hosp, Maidstone, Kent, England
[16] Maidstone & Tunbridge Wells Hosp, Pembury, England
[17] Cossham Hosp, Bristol, Avon, England
[18] Southmead Hosp, Bristol, Avon, England
[19] Colchester Gen Hosp, Colchester, Essex, England