External quality assessment schemes for real-time PCR: a statistical procedure to corrective actions

Paolo Verderio, Simon C. Ramsden*, Claudio Orlando, Sara Pizzamiglio, Angelo Paradiso, Michael Neumaier, Mario Pazzagli and Ettore Marubini 1 Unit of Medical Statistics and Biometry, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy 2 National Genetics Reference Laboratory (Manchester), St Mary’s Hospital, Manchester, UK 3 Clinical Biochemistry Unit, Department of Clinical Physiopathology, University of Florence, Florence, Italy 4 National Cancer Institute, Bari, Italy 5 Institute for Clinical Chemistry, University Hospital Mannheim of the University of Heidelberg, Mannheim, Germany 6 Institute of Medical Statistics and Biometry, University of Milan, Milan, Italy

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