Fig. 1From: Pilot field testing of the chronic pain classification for ICD-11: the results of ecological codingAll cases (absolute numbers) and cases in which more than one diagnostic code was assigned, adjusted for various coding artefacts, such as true comorbidity, multiple parenting, and missing extension codes. HA/OFP: Chronic headache or orofacial pain, MSP: Chronic secondary musculoskeletal painBack to article page