MMP3 and oculopharyngeal muscular dystrophy: Small sample sizes with respect to different sub-types of OPMD, lack of validation efforts and limited comparisons among different OPMD (e.g., studies have been conducted only in OSMF samples for MMP3 (-1171; promotor region)) restrict our scope to draw conclusions about difference in susceptibility for different OPMD with respect to the presence of a particular SNP.