Because it is a large collabration among institutions, the reference genomes for the whole genome sequencing data are different.
what I found:
- Homo_sapiens_assembly19 download link
- GRCh37-lite download link: ftp://ftp.ncbi.nih.gov/genbank/genomes/Eukaryotes/vertebrates_mammals/Homo_sapiens/GRCh37/special_requests/GRCh37-lite.fa.gz