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2. International Classification of Sleep Disorders: Diagnostic and Coding Manual;American Academy of Sleep Medicine,2014
3. Clinical Hand Book of Psychiatry and the Law;Appelbaum,2008
4. Medical examiner rules Ledger’s death accidental;Barron,2008
5. Food and Drug Administration press announcement April 2019. https://www.fda.gov/drugs/drug-safety-and-availability/fda-adds-boxed-warning-riskserious-injuries-caused-sleepwalking-certain-prescription-insomnia (retrieved January 30, 2021).