Effectiveness over time of a multimodal intervention to improve compliance with standard hygiene precautions in an intensive care unit of a large teaching hospital oleh Valentina Baccolini, Valeria D’Egidio, Pasquale de Soccio, Giuseppe Migliara, Azzurra Massimi, Francesco Alessandri, Guglielmo Tellan, Carolina Marzuillo, Corrado De Vito, Marco Vito Ranieri, Paolo Villari