MAP20130014784 Song, Peng Simulation of longitudinal exposure data with variance-covariance structures based on mixed models / Peng Song, Jianping Xue, Zhilin Li En: Risk analysis : an international journal. - McLean, Virginia : Society for Risk Analysis, 1987-2015 = ISSN 0272-4332. - 04/03/2013 Volumen 33 Número 3 - marzo 2013 I. Title.