Ritchey ME, Jonsson Funk M, Marshall SW, Marinac-Dabic D, Rutala WA, Weber DJ. Changing rate of blood-stream infection across duration of central venous access. Poster presented at the 25th International Conference on Pharmacoepidemiology & Therapeutic Risk Management; August 2009. Providence, RI. [abstract] Pharmacoepidemiol Drug Saf. 2009 Aug; 18(S1).