[1] Newcastle Tyne Hosp Natl Hlth Serv Fdn Trust, Gastroenterol, Newcastle Upon Tyne, England
[2] Newcastle Univ, Populat Hlth Sci Inst, Newcastle Upon Tyne, Tyne & Wear, England
[3] Univ Durham, Dept Math Sci, Durham, England
[4] Univ Sunderland, Fac Hlth Sci & Wellbeing, Sunderland, Durham, England
[5] Royal Wolverhampton Natl Hlth Serv Trust, Dept Gastroenterol, Wolverhampton, England
[6] Univ Wolverhampton, Deparment Gastroenterol, Wolverhampton, England
[7] Northumbria Healthcare Natl Hlth Serv Fdn Trust, Gastroenterol, North Shields, England
[8] Northumbria Univ, Dept Nursing Midwifery & Hlth, Newcastle Upon Tyne, Tyne & Wear, England
[9] Med Fac Mannheim, Ctr Prevent Med & Digital Hlth, Social & Prevent Med, Mannheim, Germany
[10] Gloucestershire Hosp Natl Hlth Serv Fdn Trust, Dept Gastroenterol, Gloucester, England
[11] North Tees & Hartlepool Natl Hlth Serv Fdn Trust, Dept Gastroenterol, Stockton On Tees, England
[12] Natl Hlth Serv London, Publ Hlth, London, England