RT Journal Article SR Electronic(1) A1 Mertens, R A1 van den Berg, J. M.J A1 Fabry, J A1 Jepsen, O. B YR 1996 T1 HELICS: a European project to standardise the surveillance of hospital acquired infection, 1994-1995 JF Eurosurveillance VO 1 IS 4 SP 28SP 154 OP 30 DO https://doi.org/10.2807/esm.01.04.00154-en UL https://www.eurosurveillance.org/content/10.2807/esm.01.04.00154-en