Hemoglobin, plasma sodium, potassium, urea, creatinine, albumin, calcium, phosphate, alkaline phosphatase, and alanine transaminase at -4, 0, 4, 8, 12, 18, 24, 30, 36, 44 and 52 weeks Fasting serum glucose, lipid and iron profile at 0, 24 and 52 weeks Serum parathyroid hormone at 0 and 52 weeks Serum inflammatory markers at 0, 12, 24, 36 and 52 weeks