TO PREVENT HYPERPHOSPHATEMIA IN A CHILD ON HEMODIALYSIS I USED CALCIUM-CARBONATE - WHAT CAN I DO NOW, SINCE HE PRESENTS WITH HYPERPARATHYROIDISM (PARATHYROID-HORMONE = 1,200 PG ML), HYPERCALCEMIA (CALCIUM = 2.8 MMOL/L), AND HYPOPHOSPHATEMIA (PHOSPHATE = 0.9 MMOL/L)/