What is the best way to find tag SNPs associated with particular candidate genes? For example, if I wanted to look at the effects of IFITM3 on influenza patients using their genotype + hospital data, what is the optimal way to find SNPs? I used the UCSC genome browser to find a few randomly chosen SNPs, but I was wondering if there is a better (i.e. to get more accurate results) way to do this in the end? I'm looking specifically for SNPs that give a clear and accurate picture of the gene of interest.