A delay locked loop increases an operation margin of a delay locked loop by using an output clock having more advanced phase than a DLL output clock. The system imports source data from disparate clinical site sources into staging databases at refresh intervals, maintains data models, and maps data from the staging databases into the data models, and feeds data from the data models into data delivery databases. The second member is also selectively mountable to the first member such that the second surface is generally horizontal and cooperates with the first surface to provide a larger support for a child seat than just the first surface alone. It also avoids using the concept of \u201ccongestion state\u201d which is essential in the existing fairness algorithm.