Serum erythropoietin and erythropoiesis in primary and secondary hyperparathyroidism: effect of parathyroidectomy. - Urena,P.; Eckardt,K.U.; Sarfati,E.; Zingraff,J.; Zins,B.; Roullet,J.B.; Roland,E.; Drueke,T.; Kurtz,A. (Nephron, 1991)