TY  - RPRT
TI  - Calibration in multi-centre cohort studies.
AU  - M Plummer
AU  - D Clayton
AU  - R Kaaks
PY  - 1994
DO  - 10.1093/ije/23.2.419
UR  - https://pubmed.ncbi.nlm.nih.gov/8082971/
ID  - 8082971
ER  -