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These conditions can mask underlying iron deficiency by elevating ferritin levels into the normal range despite depleted iron stores

Low levels of Alternaria, Cladosporium, fusarium, and yeast were detected to rise in summer, while penicillium and aspergillus were found year-round at equal concentrations

After reviewing literature and conducting a two-round Delphi survey with 42 experts, a consensus emerged that emphasizes prioritizing clinical symptoms in diagnosis, with serum B12 as a screening marker supported by methylmalonic acid or homocysteine levels for additional confirmation

doi: 10.1046/j.1365-2125.2003.01907.x Georges Delpre, Pinhas Stark, Yaron Niv, Sublingual therapy for cobalamin deficiency as an alternative to oral and parenteral cobalamin supplementation, The Lancet, Volume 354, Issue 9180, 28 August 1999, Pages 740-741, ISSN 0140-6736,