In addition, little attention has been devoted to the continuity of care necessary to respond to the growing consensus that because SUD is a chronic disorder with a relapsing-remitting course, it is necessary to link and engage patients with aftercare or continued-care programs and services. Often, there is no coordinated effort to provide a system of continuing care, which leaves patients vulnerable to frequent relapse, and there is a substantial variability within and between programs in terms of success in achieving goals for continued care. A growing view of addiction treatment is that it is a process that requires a continuum of care including management and monitoring similar to methods used in chronic-disease management. The vast majority of research on continued care has been conducted with adults. However, results of the few studies on youth receiving continued care have shown efficacy in reducing and postponing relapse.