Walz JM, Avelar RL, Longtine KJ, Carter KL, Mermel LA, Heard SO. Anti-infective external coating of central venous catheters: a randomized, noninferiority trial comparing 5-fluorouracil with chlorhexidine/silver sulfadiazine in preventing catheter colonization. Crit Care Med. 2010 Nov; 38(11):2095-102.