Association between vitamin b12 levels and melancholic depressive symptoms: a Finnish population-based study.
Seppälä J, Koponen H, Kautiainen H, Eriksson JG, Kampman O, Leiviskä J, Männistö S, Mäntyselkä P, Oksa H, Ovaskainen Y, Viikki M, Vanhala M, Seppälä J.
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BMC Psychiatry. 2013 May 24;13:145. doi: 10.1186/1471-244X-13-145.
BMC Psychiatry. 2013.
PMID: 23705786
Free PMC article.