“…Data about patients who entered the study were collected through a questionnaire, for the cause of kidney disease, age, sex, weight, occupation, disease duration, the amount of calcium and vitamin D supplements, the number of visits by in charge doctors, medicines, income and education, number of family members, and the presence of a similar sick patient in the family [7,11,14]. Blood samples were taken from patients for testing before dialysis for these elements: Calcium, phosphorus, alkaline phosphatase, creatinine, albumin, protein, parathyroid hormone and random blood sugar [15][16][17][18][19]. PTH level was used for diagnosis of bone disease.…”