 Biochemical markers of bone formation osteocalcin and total and bone specific alkaline phosphatase and bone resorption urinary collagen cross-links, N-teleopeptide and deoxypyridinoline, as well as serum cross-links, C-teleopeptide will be assayed in serumurine collected at baseline, and 1, 3, 6, 9 and 12 months following liver transplantation. 