Chronic hyponatremia in patients with proximal femoral fractures after low energy trauma: A retrospective study in a level-1 trauma center oleh Daniel Bernd Hoffmann, Christian Popescu, Marina Komrakova, Lena Welte, Dominik Saul, Wolfgang Lehmann, Thelonius Hawellek, Frank Timo Beil, Mohammed Dakna, Stephan Sehmisch