Serum immunoreactive bone sialoprotein as a new marker of bone turnover in metabolic and malignant bone disease. - Seibel,M.J.; Woitge,H.W.; Pecherstorfer,M.; Karmatschek,M.; Horn,E.; Ludwig,H.; Armbruster,F.P.; Ziegler,R. (J Clin Endocrinol Metab, 1996)