For every individual study, raw data file names were sourced via the NMDR's API for each study accession. We relied on NMDRs REST service to gain information specifying the type of each sample (e.g., T-cells or Sweat) in the form of an internally controlled vocabulary. Further metadata were sourced as mwTAB files and parsed according to the specifications provided in the mwTab documentation. mwTab provides predefined slots for NMDR-controlled vocabulary entry or free text entry of variables (e.g., SUBJECT_SPECIES, CHROMATOGRAPHY_TYPE, and COLUMN_NAME) on a per-analysis basis. We relied on combinations of substring matching and translation sheets to convert all terms into the ontology used in Pan-ReDU.