1.Cleare, A, Pariante, CM, Young, AH, Anderson, IM, Christmas, D, Cowen, PJ, et al. Evidence-based guidelines for treating depressive disorders with antidepressants: a revision of the 2008 British Association for Psychopharmacology guidelines. J Psychopharmacol 2015; 29: 459–25.
3.McAllister-Williams, RH, Christmas, DMB, Cleare, AJ, Currie, A, Gledhill, J, Insole, L, et al. Multiple-therapy-resistant-major depressive disorder: a clinically important concept. Br J Psychiatry 2018; 212: 274–278.
4.Berlim, MT, Turecki, G. Definition, assessment, and staging of treatment-resistant refractory major depression: a review of current concepts and methods. Can J Psychiatry 2007; 52: 46–54.
5.Zhou, X, Ravindran, AV, Qin, B, Del, GC, Li, Q, Bauer, M, et al. Comparative efficacy, acceptability, and tolerability of augmentation agents in treatment-resistant depression: systematic review and network meta-analysis. J Clin Psychiatry 2015; 76: e487–98.
6.Schosser, A, Serretti, A, Souery, D, Mendlewicz, J, Zohar, J, Montgomery, S, et al. European Group for the Study of Resistant Depression (GSRD)--where have we gone so far: review of clinical and genetic findings. Eur Neuropsychopharmacol 2012; 22: 453–68.
7.Conway, CR, George, MS, Sackeim, HA. Toward an evidence-based, operational definition of treatment-resistant depression: when enough is enough. JAMA Psychiatry 2017; 74: 9–10.
8.Ruhe, HG, van, RG, Spijker, J, Peeters, FP, Schene, AH. Staging methods for treatment resistant depression. A systematic review. J Affect Disord 2012; 137: 35–45.
9.Kirsch, I, Deacon, BJ, Huedo-Medina, TB, Scoboria, A, Moore, TJ, Johnson, BT. Initial severity and antidepressant benefits: a meta-analysis of data submitted to the food and drug administration. PLoS Med 2008; 5: e45.
10.Turner, EH, Matthews, AM, Linardatos, E, Tell, RA, Rosenthal, R. Selective publication of antidepressant trials and its influence on apparent efficacy. N Engl J Med 2008; 358: 252–60.
11.Furukawa, TA, Weitz, ES, Tanaka, S, Hollon, SD, Hofmann, SG, Andersson, G, et al. Initial severity of depression and efficacy of cognitive-behavioural therapy: individual-participant data meta-analysis of pill-placebo-controlled trials. Br J Psychiatry 2017; 210: 190–6.