Psychoactive substances as a last resort—a qualitative study of self-treatment of migraine and cluster headaches

Table 1 Searches with keywords “treatment cluster” for each discussion forum and limitation of searches

Discussion forum	Topics	Topics initiated last year	Included topics
Shroomery.org	409	23	7
Bluelight.org	152	27	4
Clusterbuster.org	161	12	8
Total included			19

ISSN: 1477-7517