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We will analyse the effect of vitamin B 12 separately in the following subgroups: Vitamin B 12 status: based on cobalamin (cut-off: 150 pmol/L) based on low total homocysteine (cut-off: 10 mol/L) based on low methylmalonic acid (cut-off: 0.26 mol/L) Maternal body mass index (cut-off: 18.5) Vegetarian (yes/no) Birth weight (cut-off: 2500 g) In these subgroup analyses, the differences in the effect between the levels of the subgroups will be measured by including two-way interaction terms in multiple regression models

For the maximum LDH release control group, 4 l of lysis solution (Promega, USA) was added into each well and incubated for 30 mins to initiate cell lysis prior to the next step

What to consider if your results are out of range: If you're low in vitamin D, you can incorporate vitamin D-rich foods such as fatty fish (trout, salmon, sardines), mushrooms exposed to UV light, eggs, and fortified milks---but you may also need to supplement

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