EPO and hyperparathyroidism: There were 14 (14/47) patients with symptoms that included bone symptoms in one patient with an unexplained fracture, unexplained anemia in eight patients requiring high-dose erythropoietin (excluding hyperparathyroidism) and hematological symptoms, and unexplained hypercalcemia in five patients (serum calcium ≥ 11 mg dL-1) with relatively low bone turnover syndrome.