1. The size and burden of mental disorders and other disorders of the brain in Europe 2010;Wittchen;Eur Neuropsychopharmacol,2011
2. Manifestations and management of chronic insomnia in adults;NIH. National Institutes of Health;Sleep,2005
3. Diagnostic and statistical manual of mental disorders DSM-5;APA. American Psychiatric Association,2013
4. Sleep onset insomnia, sleep maintaining insomnia and insomnia with early morning awakening - temporal stability of subtypes in a longitudinal study on general practice attenders;Hohagen;Sleep,1994
5. The nature of stable insomnia phenotypes;Pillai;Sleep,2015