@article {li3,
	title = {Comparison of proportions for composite endpoints with missing components},
	journal = {Journal of Biopharmaceutical Statistics, NIHMSID: 316386},
	volume = {21},
	year = {2011},
	pages = {271{\textendash}281},
	author = {Li, X and Caffo, B}
}
@article {li2007potential,
	title = {On the potential for ill logic with logically defined outcomes},
	journal = {Biostatistics},
	volume = {8},
	number = {4},
	year = {2007},
	pages = {800},
	author = {Li, X and Caffo, B and Scharfstein, D}
}
