@article{gregory2016-26772171,
  author  = {Gregory, M. A. and Gill, D. P. and Shellington, E. M. and Liu-Ambrose, T. and Shigematsu, R. and Zou, G. and Shoemaker, K. and Owen, A. M. and others},
  title   = {{Group-based exercise and cognitive-physical training in older adults with self-reported cognitive complaints: The Multiple-Modality, Mind-Motor (M4) study protocol}},
  journal = {BMC geriatrics},
  year    = {2016},
  doi     = {10.1186/s12877-016-0190-9},
  pmid    = {26772171},
  url     = {https://doi.org/10.1186/s12877-016-0190-9}
}