Hi, Can someone explains me what does the following sentence mean?

" The SNPs used were curated into the NHGRI GWAS catalog (Welter et al. (2014)) and obtained through the UCSC Table Browser (Karolchik et al. (2004)) on September 12, 2014."

from: (http://egg2.wustl.edu/roadmap/web_portal/tissue_sp_act.html)

Thanks