Table 1.
Clinical conditions considered exclusion criteria for patients’ enrolment
| Clinical conditions | ICD9 codes |
|---|---|
| Malabsorption syndromes | From 5793 to 5799 |
| Rheumatoid arthritis | 7140 |
| Moderate to severe CKD | From 5853 to 5859, 586 and 6393 |
| Hyperthyroidism | From 24,200 to 24,291 |
| Primary hyperparathyroidism | From 25,200 to 25,208 |
| Hypoparathyroidism | 2521 |
| Cushing’s syndrome | 2550 |
| Chronic liver disease | From 5710 to 5719 |
| Pituitary tumors | 1943, 2273, 2370 |
| Surgical history of terminal ileal resection | 4562 |
| Surgical history of gastrectomy or small bowel bypass | From 430 to 4499 |
| Eating disorders | 3071, from 30,750 to 30,759 |
| Alcoholism | From 30,390 to 30,393 |
ICD9 International Classification of Diseases 9th revision, CKD chronic kidney disease