The<unk>  (CFS) vary. Different agencies and scientific bodies have produced different guidelines to define the condition, with some overlap of symptoms between<unk> . Aspects of the condition are controversial, with disagreements over etiology, pathophysiology, treatment and naming between medical practitioners, researchers, patients and advocacy groups. Subgroup analysis suggests that, depending on the applied definition, the CFS population may represent a variety of conditions rather than a single disease entity.
Clinical descriptions of chronic fatigue syndrome
Headache attributed to a substance or its withdrawal
Psychological effects of Internet use
Antidepressants and suicide risk
Treatments for PTSD
Comparison of bipolar disorder and schizophrenia
Animal model of schizophrenia
Biology of obsessive–compulsive disorder