@misc{8339,
  author = {K. Rhodes and R. Turner and R. Payne and I. White},
  title = {Computationally efficient methods for fitting mixed models to electronic health records data},
  year = {2018},
  journal = {Stat Med},
  volume = {37},
  number = {29},
  pages = {4557-4570},
  issn = {0277-6715},
  doi = {10.1002/sim.7944},
}