The analysis of the geographical distribution of emergency departments’ frequent users: a tool to prioritize public health policies? oleh Romain Hellmann, Anne-Laure Feral-Pierssens, Alain Michault, Enrique Casalino, Agnès Ricard-Hibon, Frederic Adnet, Dominique Brun-Ney, Donia Bouzid, Axelle Menu, Mathias Wargon