Extract loci from GWAS/QTL summary statistics

Usage

extract_loci(topSNPs, fullSS, bp_distance = 5e+05, munged = TRUE)

topSNPs: Positions of the top SNPs prepare using import_topSNPs.
fullSS: data.table of the full GWAS/QTL summary statistics.
bp_distance: The basepair distance upstream/downstream of the proxy SNP (in topSNPs) to extract.
munged: Whether fullSS was previously munged with format_sumstats.