Thrombopoetin in patients with congenital thrombocytopenia and absent radii: elevated serum levels, normal receptor expression, but defective reactivity to thrombopoetin - Ballmaier,M.; Schulze,H.; Strauß,G.; Cherkaoui,K.; Wittner,N.; Lynen,S.; Wolters,S.; Bogenberger,J.; Welte,K. (Blood, 1997)