“ World Federation of Societies of Biological Psychiatry (WFSBP) Guidelines for Biological Treatment of Unipolar Depressive Disorders, Part 2: Maintenance Treatment of Major Depressive Disorder and Treatment of Chronic Depressive Disorders and Subthreshold Depressions ”. 2009. Archives of Clinical Psychiatry 36 (supl.2): 58-76. https://doi.org/10.1590/S0101-60832009000800002.