C. Geffers, D. Sohr, and P. Gastmeier. Infection Control and Hospital Epidemiology: The Official Journal of the Society of Hospital Epidemiologists of America, 29 (12):
1167--1170(December 2008)PMID: 19014317.
S. Yamamoto, H. Shima, and T. Matsumoto. International Journal of Urology: Official Journal of the Japanese Urological Association, 15 (6):
467--471(June 2008)PMID: 18422575.