Research article
Catechol-O-methyltransferase gene haplotypes in Mexican and Spanish patients with fibromyalgia
Arthritis Research & Therapy 2007, 9:R110 doi:10.1186/ar2316
See related letter by Martinez and Cassol, http://arthritis-research.com/content/10/6/408, and related response by Eisinger, http://arthritis-research.com/content/10/6/409
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