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. 2019 Sep 20;10:1102. doi: 10.3389/fphar.2019.01102

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Copyright © 2019 van Campen, Riepma and Visser

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Serum vitamin B12 levels (pmol/l) before and after 3 months treatment. The panel (A) shows the non-responders (n = 17), and the panel (B) shows the responders (n = 34).