... competing interests.Authors' contributionsLR, JMV, ME and JA participated in the conception and design of the study. LR, JAPV, and EVO analyzed the data.MH and LR participated in the drafting ... health in children have beencross-sectional [2-4]. Few, if any, studies have examinedthis association using a longitudinal design. In compari-son with cross-sectional studies, longitudinal studies ... whichimprovements in psychopathology correspond toimprovements in quality of life and, conversely, to inves-tigate the effect of a deterioration or persistence of mentalproblems in terms of their impact on...