title: The concept and phenomenology of depression, with special reference to the aged. Introduction.
mesh_terms: D000275:Adjustment Disorders / Q000175:diagnosis; D000368:Aged; D003192:Compulsive Behavior / Q000175:diagnosis; D003863:Depression / Q000175:diagnosis*; D003937:Diagnosis, Differential; D006801:Humans; D008132:Loneliness; D012934:Social Isolation; D009626:Terminology as Topic