Table 2 Rounds of the consensus process. After each round and before the next one, anonymized results and comments were shared. *Residual disagreement regarded 2 different issues from 2 different members of the group: 1. Threshold of headache days per month: 6 was the suggested alternative; 2 Assessment of patients: no need to be assessed by headache centers

From: European headache federation consensus on the definition of resistant and refractory migraine