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Brit Med J 368:m1198 Lu R, Zhao X, Li J, Niu P, Yang B, Wu H et al (2020) Genomic characterisation and epidemiology of 2019 novel coronavirus: implications for virus origins and receptor binding
Your ideal frequency comes down to what you're aiming for and where your levels sit now
Other at-risk groups include people with coeliac or Crohns disease, those who have had weight loss surgery, and those with atrophic gastritis or pernicious anaemia
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