1. Aizawa E, Tsuji H, Asahara T, Takahashi T, Teraishi T, Yoshida S, Ota M, Koga N, Hattori K, Kunugi H (2016) Possible association of Bifidobacterium and lactobacillus in the gut microbiota of patients with major depressive disorder. J Affect Disord 202:254–257
2. Alpert JE, Fava M (1997) Nutrition and depression: the role of folate. Nutr Rev 55(5):145–149
3. Anglin RE, Samaan Z, Walter SD, McDonald SD (2013a) Vitamin D deficiency and depression in adults: systematic review and meta-analysis. Br J Psychiatry 202:100–107
4. Anglin RE, Samaan Z, Walter SD, McDonald SD (2013b Feb) Vitamin D deficiency and depression in adults: systematic review and meta-analysis. Br J Psychiatry 202:100–107. https://doi.org/10.1192/bjp.bp.111.106666
5. Anisman H (2009) Cascading effects of stressors and inflammatory immune system activation: implications for major depressive disorder. J Psychiatry Neurosci 34:4–20