TY  - RPRT
TI  - Estimating historical changes in physical activity levels.
AU  - G J Egger
AU  - N Vogels
AU  - K R Westerterp
DO  - 10.5694/j.1326-5377.2001.tb143758.x
UR  - https://pubmed.ncbi.nlm.nih.gov/11837872/
ID  - 11837872
ER  -