1. Wittchen HU, Jacobi F, Rehm J, et al.: The size and burden of mental disorders and other disorders of the brain in Europe 2010. Eur Neuropsychopharmacol 2011; 9: 655–79
2. WHO: Depression and Other Common Mental Disorders: Global Health Estimates. Geneva: World Health Organization; 2017. Licence: CC BY-NC-SA 3.0 IGO (http://apps.who.int/iris/bitstream/handle/10665/254610/WHO-MSD-MER-2017.2-eng.pdf;jsessionid=829EAD6A4E0473EBDE28F4FD23B8D556?sequence=1) (last accessed on 22 August 2018).
3. Dilling H: Internationale Klassifikation Psychischer Störungen: ICD-10 Kapitel V (F); Klinisch-diagnostische Leitlinien. 8th revised edition ICD-10-GM 2011. Bern: Huber 2011.
4. WHO: ICD-11. https://icd.who.int/dev11/l-m/en. (last accessed on 22 August 2018).
5. Silove D, Alonso J, Bromet E, et al.: Pediatric-onset and adult-onset separation anxiety disorder across countries in the world mental health survey. Am J Psychiatry 2015; 172: 647–56