background_ids: Generate the list of available GWAS summary statistics
In universe77/mr.ios: Index of Suspicion

Returns list of IDs of available GWAS summary statistics. The data is obtained from [IEU GWAS database](https://gwas.mrcieu.ac.uk/).

background_ids(
  id_exp = id_exp,
  id_out = id_out,
  type = c("default", "broad", "eqtl", "metabolite", "protein", "ubm")[1]
)

id_exp

ID for the exposure in IEU GWAS database.

id_out

ID for the outome in IEU GWAS database.

type

Set a default list of IDs.

default: Returns list of IDs of GWAS summary statistics generated by many different consortia and generated from UKB.
broad: In addition to the default list, it returns list of IDs of GWAS summary data on protein, metabolite, and eQTL levels, as well as GWAS summary statistics imported from the EBI database.
eqtl: Returns list of IDs of eQTLGen 2019 results, comprising all cis and some trans regions of gene expression in whole blood.
metabolite: Returns list of IDs of metabolite studies including human blood / immune system / circulating metabolites.
protein: Returns list of IDs of GWAS summary data on protein levels.
ubm: Returns list of IDs of GWAS summary data on brain region volumes.