Correction: Folate Augmentation of Treatment – Evaluation for Depression (FolATED): protocol of a randomised controlled trial oleh Roberts Seren, Bedson Emma, Hughes Dyfrig A, Lloyd Keith R, Menkes David B, Moat Stuart J, Pirmohamed Munir, Slegg Gary P, Thome Johannes, Tranter Richard, Whitaker Rhiannon, Wilkinson Clare, Russell Ian T