Cumulative occupational lumbar load and lumbar disc disease – results of a German multi-center case-control study (EPILIFT) oleh Michaelis Martina, Luttmann Alwin, Linhardt Oliver, Hofmann Friedrich, Haerting Johannes, Grifka Joachim, Elsner Gine, Ditchen Dirk, Ellegast Rolf, Jäger Matthias, Bergmann Annekatrin, Seidler Andreas, Petereit-Haack Gabriela, Schumann Barbara, Bolm-Audorff Ulrich