1. Facts About Suicide [Fact sheet]. https://www.cdc.gov/suicide/facts/index.html, 2021, Accessed Date Accessed 2021 Accessed.
2. American Psychiatric Association., American Psychiatric Association. DSM-5 Task Force. Diagnostic and statistical manual of mental disorders: DSM-5. 5th edn. American Psychiatric Association: Washington, D.C., 2013, xliv, 947 p.pp.
3. Jeremy Howick IC, Paul G, Trish G, Carl H, Alessandro L, Ivan M, et al. The Oxford Levels of Evidence 2. Oxford Centre for Evidence-Based Medicine 2011.
4. Jeremy Howick IC, Paul G, Trish G, Carl H, Alessandro L, Ivan M, et al. The 2011 Oxford CEBM Levels of Evidence (Introductory Document). 2011.
5. Jeremy Howick IC, Paul G, Trish G, Carl H, Alessandro L, Ivan M, et al. Explanation of the 2011 Oxford Centre for Evidence-Based Medicine (OCEBM) Levels of Evidence (Background Document). 2011.