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. 2016 Jun 15;6:28237. doi: 10.1038/srep28237

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(A) System overview showing the custom B₁₂ test strip that accepts and anlayzes whole blood samples, two versions of the smartphone based accessory that accurately read the test strips, and smartphone app (B) NutriPhone app for guiding the users step-by-step through the test protocol and displaying the B₁₂ results at the end.