[1] Sandwell & West Birmingham NHS Trust Hosp, Diabet, Birmingham, W Midlands, England
[2] Bellvitge Univ Hosp, Gen & Digest Surg, Barcelona, Spain
[3] Epworth Med Fdn, Richmond, Australia
[4] DGD Klin Frankfurt Sachsenhausen, Frankfurt, Germany
[5] Univ Med Ctr Ljubljana, Endocrinol Diabet & Metab, Ljubljana, Slovenia
[6] Tel Aviv Sourasky Med Ctr, Gastroenterol, Tel Aviv, Israel
[7] Univ Hosp Southampton NHS Fdn Trust, Surg, Southampton, Hants, England
[8] Maastricht Univ, Surg, Med Ctr, Maastricht, Netherlands
[9] Maastricht Univ, Med Ctr, NUTRIM, Maastricht, Netherlands
[10] Hosp Alemao Oswaldo Cruz, Sao Paulo, Brazil
[11] Guys & St Thomas NHS Fdn Trust, Diabet & Endocrinol, London, England