@article{Gregg2003,
author = {Gregg, E.W. and Cauley, J.A. and Stone, K. and Thompson, T.J. and Bauer, D.C. and Cummings, S.R. and Ensrud, K.E. and Study of Osteoporotic Fractures Research Group},
title= {Relationship of changes in physical activity and mortality among older women},
year = {2003},
doi = {10.1001/jama.289.18.2379},
URL = {https://doi.org/10.1001/jama.289.18.2379},
volume = {289},
number = {18},
pages = {2379‒2386},
}