TY  - RPRT
TI  - Comparison of study controls.
AU  - Seiichiroh Ohsako
AU  - Chiharu Tohyama
PY  - 2005
DO  - 10.1289/ehp.113-1280432
UR  - https://pubmed.ncbi.nlm.nih.gov/16140606/
ID  - 16140606
ER  -