Missed opportunities of HIV pre-exposure prophylaxis in France: a retrospective analysis in the French DAT’AIDS cohort oleh C. Lions, O. Cabras, L. Cotte, T. Huleux, A. Gagneux-Brugnon, A. Makinson, A. Cabié, B. Bonnet, C. Duvivier, L. Hocqueloux, E. Cua, A. Cheret, L. Hustache-Mathieu, V. Obry-Roguet, C. Jacomet, I. Poizot-Martin, the DAT’AIDS STUDY GROUP