Application of the Modular Approach to an In-House Validation Study of Real-Time PCR Methods for the Detection and Serogroup Determination of Verocytotoxigenic Escherichia coli4844, Kagkli, D.M., Weber T.P., Van den Bulcke Marc, Folloni S., Tozzoli R., Morabito S., Ermolli M., Gribaldo L., and Van den Eede G. , Appl.Environ.Microbiol., 0/10/2011, Volume 77, Issue 19, Number 6963, p.6954 - 6963, (2011)