The same variants were not associated with endogenous pain modulation in a subsequent study (Treister et al., 2011). Also a study for assocation with fibromyalgia was negative (Amblin et al., 2009).
Four other studies looking at different variants for migraine were negative: Mochi et al., 2003; Karwautz et al., 2008; McCallum et al., 2007; Corominas et al., 2009.
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