TY  - RPRT
TI  - Modelling physical activity: a multi-state life-table approach.
AU  - M I Tobias
AU  - M G Roberts
PY  - 2001
DO  - 10.1111/j.1753-6405.2001.tb01836.x
UR  - https://pubmed.ncbi.nlm.nih.gov/11357910/
ID  - 11357910
ER  -