@article {caffo2007flexible,
	title = {Flexible random intercept models for binary outcomes using mixtures of normals},
	journal = {Computational Statistics and Data Analysis, PMCID: PMC2031853},
	volume = {51},
	number = {11},
	year = {2007},
	pages = {5220{\textendash}5235},
	publisher = {Elsevier},
	author = {Caffo, B and An, M and Rohde, C}
}
