@misc{indiciae8063b69072ca,
  title = {Modelling physical activity: a multi-state life-table approach.},
  author = {M I Tobias and M G Roberts},
  year = {2001},
  doi = {10.1111/j.1753-6405.2001.tb01836.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/11357910/},
  note = {Source identifier: 11357910}
}