Fig. 1

According to the department, name tags were coloured differently and could be filled out individually beneath the profession (white field). Professions were ‘surgery’, ‘anaesthesia’, ‘OR nurse’, ‘anaesthetic nurse’, ‘service/cleaning’ and ‘guest’ (from upper left to bottom right) (a). In (b) name tags used during surgery are circled. Written informed consent obtained by individuals in the picture is available