<qa>  What is the goal of the study of the antibiotic lock therapy?- The cost effectiveness of using the antibiotic lock therapy has not been well studied to date and will have a significant impact on the eventual formulation of treatment guidelines. In the setting of current economic burden in the health care industry, study of this issue is vital and timely. The vision of a simple, cheap intervention that can result in savings of millions of dollars is central to this study. 