"altered anatomy, e.g. post-bariatric surgery"
"Helicobacter pylori infection"
"Helicobacter pylori infection"
"endoscopy: upper GI endoscopy (gastroscopy), colonoscopy (or sigmoidoscopy)"
"In addition to the general clinical features of anaemia, patients may have koilonychia, atrophic glossitis, and pica for ice (pagophagia) 3. There is also a clinical association with restless legs syndrome 3."