OPG: An example data for forest plot using METAL output
Description
This example contains METAL outputs (OPGtbl) as with association statistics from contributing studies (OPGall).
It is appropriate to use chr:pos_A1_A2 (A1<=A2) (SNPID) rather than reference id (rsid) due to its
variability -- therefore a SNPID-rsid mapping file (OPGrsid) is also provided.