1. The prevalence of psychiatric disorders among cancer patients;Derogatis;JAMA,1983
2. Comorbidity of mental and insomnia disorders in the general population;Ohayon;Compr Psychiatry,1998
3. Diagnostic and statistical manual of mental disorders DSM-IV-TR. American Psychiatric Association; 2000. p. 820.
4. International classification of diseases and related health problems, ICD-10. 10th revision, edition 2010. World Health Organization; 2011.
5. Anxiety disorders in cancer patients: their nature, associations and relation to quality of life;Stark;J Clin Oncol,2002