1 From Gastroenterology (J. Coenen), Imperial College Healthcare NHS Trust, London; and Departments of Neurology (J. Cleaver, G.C.) and Neuroradiology (R.J.), Royal United Hospital Bath NHS Trust, UK. [email protected].
2 From Gastroenterology (J. Coenen), Imperial College Healthcare NHS Trust, London; and Departments of Neurology (J. Cleaver, G.C.) and Neuroradiology (R.J.), Royal United Hospital Bath NHS Trust, UK.