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"The neuroanatomical relation to the underlying cause
must still be recognizable even if pain is not felt in the entire
innervation territory of an affected peripheral nerve or root, or the
somatotopic representation corresponding to a lesion or disease
of the central nervous system, or if pain extends somewhat
outside these boundaries."
Scholz et al. (January 2019). The IASP classification of chronic pain for ICD-11:
chronic neuropathic pain. PAIN. 160, 53-59.