Normal serum concentrations of S100 protein and changes in cerebrospinal fluid concentrations of S-100 protein during and after thoracoabdominal aortic aneurysm surgery: Is S-100 protein a biochemical marker of clinical value in detecting spinal cord ischemia. - van Dongen,E.P.; Ter Beek,H.; Boezeman,E.H. (J Vasc Surg, 1998)