TY  - RPRT
TI  - Cross calibration in longitudinal studies.
AU  - Walter T Ambrosius
AU  - Siu L Hui
PY  - 2004
DO  - 10.1002/sim.1868
UR  - https://pubmed.ncbi.nlm.nih.gov/15344190/
ID  - 15344190
ER  -