“…Finally, at the fifth post-operative day, or at the patient's discharge, whatever came first, any infection (proven or suspected) was (11)(12)(13)(14)(15)(16) or, if no study was available, on the wound classification (9,10), and was finalized on a consensus meeting of the National Working Group on Hospital Hygiene. * The second indication class was purposely kept large, in order to enhance acceptance of the classes 1 and 3.…”