Seasonal variations of preoperative vitamin D deficiency and secondary hyperparathyroidism before lumbar fusion surgery by P. Köhli, J. Hambrecht, J. Zhu, E. Chiapparelli, A.E. Guven, K. Tsuchiya, E. Otto, L. Schönnagel, D. Jahn, J. Shue, M. Burkhard, M. Pumberger, A.A. Sama, F.P. Girardi, F.P. Cammisa, A.P. Hughes

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