Bright light in elderly subjects with nonseasonal major depression: a double blind, randomized clinical trial using early morning blue light comparing dim red light treatment.Quality of marriages in later life and emotional and social lonelinessBright light therapy in Parkinson's Disease: an overview of the backgroud and evidence.Bright light treatment in elderly patients with nonseasonal major depressive disorder.Relation between neuritic plaques and depressive state in Alzheimer's disease.