ESR1 and migraine disorder: It has been found, that the ACE-DD variant (allele model: OR: 1.37 [1.11–1.69], I2 = 0%/ fixed model), ESR1-PvuII (allele model: OR: 1.47 [1.24–1.74], I2 = 0%/ fixed model) significantly increases the risk of migraine in Indian population.