Also known as: Depression, Treatment Resistant / Treatment-resistant Depression (TRD) / Resistant Depression, Treatment / Treatment-Resistant Depression / Treatment Resistant Depression (TRD) / Treatment Resistant Depression / Major depressive disorder, recurrent, unspecified / Recurrent major depressive episodes (disorder) / Major depressive disorder, recurrent / Recurrent major depression (disorder) / Treatment resistant depression (disorder) / Depressive Disorder, Treatment-Resistant / Major depressive disorder, single episode, unspecified / Major depressive disorder / Major depressive illness / Major depressive disorder (disorder) / Major depression / Major depressive disorder NOS / Depressive Disorder, Major / Depressive state / Depression NOS / Depressed state / Depression / Depression mental