@misc{indiciae5484cf75c3e2,
  title = {Data-based approach for developing a physical activity frequency questionnaire.},
  author = {M Bernstein and D Sloutskis and S Kumanyika and A Sparti and Y Schutz and A Morabia},
  year = {1998},
  doi = {10.1093/oxfordjournals.aje.a009427},
  url = {https://pubmed.ncbi.nlm.nih.gov/9457004/},
  note = {Source identifier: 9457004}
}