@article {thomadakis2023issues,
	title = {Issues with the expected information matrix of linear mixed models provided by popular statistical packages under missingness at random dropout},
	journal = {Statistics in Medicine},
	year = {2023},
	publisher = {Wiley Online Library},
	author = {Thomadakis, Christos and Pantazis, Nikos and Touloumi, Giota}
}
