MIGRAINE Clinical endocannabinoid deficiency (CECD): Can this concept explain therapeutic benefits of cannabis in migraine, fibromyalgia, irritable bowel syndrome and other treatment-resistant conditions? (PubMed)Effects of anandamide in migraine: data from an animal model (PubMed)Cannabinoids and hallucinogens for headache (PubMed)The endocannabinoid system and migraine (PubMed)Variations in the cannabinoid receptor 1 gene predispose to migraine (PubMed)