@misc{indiciaeb75fda0a95a0,
  title = {A method for fitting regression splines with varying polynomial order in the linear mixed model.},
  author = {Lloyd J Edwards and Paul W Stewart and James E MacDougall and Ronald W Helms},
  year = {2006},
  doi = {10.1002/sim.2232},
  url = {https://pubmed.ncbi.nlm.nih.gov/16158407/},
  note = {Source identifier: 16158407}
}