Impact at two years of an intervention on empowerment among medical care teams: study protocol of a randomised controlled trial in a large French university hospital oleh Baptiste Cougot, Jules Gauvin, Nicolas Gillet, Kalyane Bach-Ngohou, Johan Lesot, Isaac Getz, Xavier Deparis, Claire Longuenesse, Anne Armant, Emmanuelle Bataille, Brice Leclere, Ghozlane Fleury-Bahi, Leïla Moret, Dominique Tripodi