title: Difficulties to study the geographical origin of a publication.
authors: Fire Brigade of Paris, Paris, France.
authors: Stéphane
authors: S
authors: Travers
authors: Michel
authors: M
authors: Bignand
authors: Olivier
authors: O
authors: Bon
authors: Marilyn
authors: M
authors: Franchin
authors: Jean Pierre
authors: JP
authors: Tourtier
mesh_terms: D035843:Biomedical Research / Q000706:statistics & numerical data*; D004632:Emergency Medical Services; D004635:Emergency Medicine; D005260:Female; D006801:Humans; D008297:Male; D011642:Publications / Q000706:statistics & numerical data*