2. Methods
POLAND
It was an open, prospective, crossover manikin study approved by the Local Ethics Committee of Medical University of Lodz, Poland (protocol number RNN/163/13/KB). Sixty paramedics and paramedic students were recruited. Participants were divided into 2 equal groups depending on their experience (n = 30). Experienced participants were further randomly divided into 2 groups (n = 15). Inexperienced participants were also randomly divided into 2 groups (n = 15). (Fig. Flow diagram.