O. P. Almeida, A. H. Ford, V. Hirani, V. Singh, F. M. van Bockxmeer, K. McCaul, and L. Flicker, «B Vitamins to Enhance Treatment Response to Antidepressants in Middle-aged and Older Adults: Results from the B-VITAGE Randomised, Double-blind, Placebocontrolled Trial». British Journal of Psychiatry 205, no. 6 (Dec. 2014): 450–457.