1. Diagnostic and statistical manual of mental disorders;American Psychiatric Association,2013
2. Nocturnal symptom complex in PD and its management;Chaudhuri;Neurology,2003
3. Insomnia and sleepiness in Parkinson disease: Associations with symptoms and comorbidities;Chung;Journal of Clinical Sleep Medicine: Official Publication of the American Academy of Sleep Medicine,2013
4. Anxiety disorders in Parkinson's disease: Prevalence and risk factors;Dissanayaka;Movement Disorders: Official Journal of the Movement Disorder Society,2010
5. Depression in Parkinson's disease: Symptom improvement and residual symptoms after acute pharmacologic management;Dobkin;American Journal of Geriatric Psychiatry: Official Journal of the American Association for Geriatric Psychiatry,2011