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Prevalence and risk factors for nosocomial infections in four university hospitals in Switzerland.

P. Francioli, D. Pittet, S. Harbarth, 1999, Infection control and hospital epidemiology.

Nosocomial infections in Swiss university hospitals: a multi-centre survey and review of the published experience. Swiss-Noso Network.

P. Francioli, D. Pittet, A. Widmer, 1999, Schweizerische medizinische Wochenschrift.