Prevalence of colonisation with third generation cephalosporin-resistant enterobacteriacae (3GCREB) on admission - a cross-sectional study in 6 university hospitals. Issue 1 (December 2015) - Rohde, AM; Zweigner, J; Wiese-Posselt, M; Hamprecht, A; Kern, W; Gastmeier, P; Seifert, H