@article {pantazis2005bivariate,
	title = {Bivariate modelling of longitudinal measurements of two human immunodeficiency type 1 disease progression markers in the presence of informative drop-outs},
	journal = {Journal of the Royal Statistical Society: Series C (Applied Statistics)},
	volume = {54},
	number = {2},
	year = {2005},
	pages = {405{\textendash}423},
	publisher = {Blackwell Publishing Ltd},
	author = {Pantazis, Nikos and Touloumi, Giota and Walker, AS and Babiker, AG}
}
