TY  - RPRT
TI  - The Campbell Collaboration--C2.
AU  - Jim Thornton
PY  - 2003
DO  - 10.1111/j.1471-0528.2003.03010.x
UR  - https://pubmed.ncbi.nlm.nih.gov/14511959/
ID  - 14511959
ER  -