“…Six studies [21, 22, 31, 38–40] were conducted in specialty headache clinics, one [35] in an inpatient treatment setting, and five [13, 15, 17, 32, 33] evaluated headache care in emergency departments. Four studies [17, 19, 28, 39] assessed diagnostic accuracy, while eight [16, 18, 23, 26, 27, 31, 34, 35] evaluated the effects of specific strategies of headache management. Only two of the studies [31, 34] included a control group; one of these [34] was a randomized clinical trial.…”