Methods: Ninety-six Health Care Professionals (HCPs) participated in a randomised, cross-over, openlabel,time
and motion study in Belgium (2014). HCPs prepared each vaccine in a cross-over manner with a
wash-out period of 3–5 min.Anindependentnurse assessed preparationtime and immunisationerrors by
systematic review of the videos. HCPs satisfaction and preference were evaluated by a self-administered
questionnaire.