These modules have been put together based on the NICE Guideline on B12 Deficiency, Research into Pernicious Anaemia (also sometimes called autoimmune gastritis or Addison Biermer's) by the Pernicious Anaemia Society with the input and support of clinicians and researchers from the UK healthcare profession including General Practitioners, Nurse, Midwife, and specialist secondary care consultants. The Pernicious Anaemia Society is a registered charity whose mission is to support patients, raise awareness and improve education and support