settings, the hospital Medical Directorate, in collaboration with the University Hygiene and Public Health Units, were the leading project managers of the SIV campaigns. In order to implement the 2017--18 SIV campaigns and to assess their impact, a multi-step approach was adopted: Planning phase, aimed at defining the main objective, sub-objectives and the actions part of the SIV campaigns by the leading project managers.Implementation phase, aimed at carrying out the actions of the program, grouped into "Education", "Promotion", and "Access to vaccination" ([Table 1](#T0001)) with the collaboration of the Hygiene Unit and the Occupational Medicine Unit.Monitoring phase, aimed at controlling the actions of the implementation phase, with the collaboration of two residents in Hygiene and Public Health from each of the three Universities. By taking part in thetop edge 110 of the outer shell 102 is connected to a top edge of the inner shell 104. This connection causes the inner shell 104 to hang behind the outer shell 102. It should be appreciated that this construction results in an air gap between most of the inner shell 104 and outer shell 102 including the locations of the sensors 108 and target areas 106.
An issue with this configuration is that with repeated use, the inner shell 104 can become misaligned with the outer shell 102. For instance, the top edge 112 could become partially or fully disconnected from the outer shell 102. Additionally or alternatively, the inner shell 104 (including the sensor 108) can become ripped or stretched through use, thereby causing misalignment. In yet