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In real-world testing, timing matters

In arriving at our criteria we consulted three standard textbooks of medicine (Alstead, Davidson and Price), a consultant haematologist, the librarian at the Royal College of General Practitioners, and the Monthly Index of Medical Specialities

To take the B12 energy shot (or not)

[Crossref] [Google Scholar] [PubMed] Tiemeier H, Van Tuijl HR, Hofman A, Meijer J, Kiliaan AJ, Breteler MMB