TY  - RPRT
TI  - Conceptual and technical considerations when combining large data sets.
AU  - A J Orsi
AU  - M Grey
AU  - M M Mahon
AU  - H J Moriarty
AU  - M P Shepard
AU  - R M Carroll
PY  - 1999
DO  - 10.1177/01939459922043785
UR  - https://pubmed.ncbi.nlm.nih.gov/11512172/
ID  - 11512172
ER  -