Severe Vitamin B12 Deficiency Presenting as Pancytpenia, Hemolytic Anemia, and Parasthesia:Could Your B12 Be Any Lower?
Cureus doi:10.7759/cureus 29225, Pelling,M.M., et al, 2022
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Medicine 71:139-164, Brewer,G.J.&Yuzbasiyan-Gurkan,V., 1992