1. Deutsche Krebsgesellschaft, Deutsche Krebshilfe, AWMF: Leitlinienprogramm Onkologie. Palliativmedizin für Patienten mit einer nicht-heilbaren Krebserkrankung, Langversion 2.2, 2020, AWMF-Registernummer: 128/001OL, https://www.leitlinienprogramm-onkologie.de/leitlinien/palliativmedizin/ (last accessed on 7 July 2021).
2. Merskey H: Classification of chronic pain. Descriptions of chronic pain syndromes and definitions of pain terms. Prepared by the International Association for the Study of Pain, Subcommittee on Taxonomy. Pain Suppl. 1986; 3: 1–226. PMID: 3461421.
3. World Health Organization: The ICD-10 classification of mental and behavioral disorders: clinical descriptions and diagnostic guidelines. Geneva, Switzerland: World Health Organization, WHO; 1992.
4. World Health Organization: Cancer pain relief: With a guide to opioid availability, 2nd ed. Geneva, Switzerland: World Health Organization; 1996.
5. Bennett MI, Kaasa S, Barke A, Korwisi B, Rief W, Treede RD; IASP Taskforce for the Classification of Chronic Pain. The IASP classification of chronic pain for ICD-11: chronic cancer-related pain. Pain. 2019 Jan; 160 (1): 38–44. doi: 10.1097/j.pain.0000000000001363