I am currently working on matching ROSMAP bulk RNA-seq (brain) IDs with ROSMAP array genotype data. While both datasets are reported to overlap for approximately 1,000 participants, I have only been able to match around 700 IDs successfully. Here is the data I am using: **Array fam files: **ROSMAP_arrayGenotype.fam **Array metadata:** ROSMAP_assay_snpArray_metadata.csv **RNA-seq metadata:** ROSMAP_assay_rnaSeq_metadata.csv **Clinical file:** ROSMAP_clinical.csv **Biospecimen metadata:** ROSMAP_biospecimen_metadata.csv I would greatly appreciate any guidance or suggestions on where I might be missing the remaining matches. Are there specific fields, formats, or additional metadata files I should be considering to ensure a comprehensive match between these datasets?