@misc{indiciaeebb311470bc8,
  title = {A SAS macro for constrained randomization of group-randomized designs.},
  author = {M Ashraf Chaudhary and Lawrence H Moulton},
  year = {2006},
  doi = {10.1016/j.cmpb.2006.04.011},
  url = {https://pubmed.ncbi.nlm.nih.gov/16870302/},
  note = {Source identifier: 16870302}
}