“…The genomic DNA from the peripheral blood leucocytes of each investigated subject was prepared applying the QIAamp Blood Mini Kit (Blossom, Taipei, Taiwan) and stored at −80˚C until processed as per our recent publications (25)(26)(27)(28). The sequences of primers and the restriction enzymes for MMP1 promoter 1607 genotyping are the same as our previous publication (29)(30)(31). Briefly, the sequences for forward and reverse primer pairs were 5'-TGACTTTTAAAACATAGTCTATGT-3' and 5'-GATTG ATTTGAGATAAGTCATAGC-3', respectively.…”