Table 1. Description of and information for the four investigated single-nucleotide polymorphisms (SNPs). Chr, chromosome.

Gene and ensemble gene number	dbSNP ID	Chr position	Region	Alleles
MMP-9	rs3918249	Chromosome 20:44638136	Intron 1	T/C
ENSG00000100985	rs2274756	Chromosome 20:44643111	Exon 12	G/A
TIMP-3	rs9609643	Chromosome 22:33251059	Intron 2	G/A
ENSG00000100234	rs8136803	Chromosome 22:33237112	Intron 1	G/T