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Table 2 Eligibility criteria of the NOSTONE study

From: Efficacy of standard and low dose hydrochlorothiazide in the recurrence prevention of calcium nephrolithiasis (NOSTONE trial): protocol for a randomized double-blind placebo-controlled trial

Inclusion criteria

 Individuals fulfilling all of the following inclusion criteria are eligible for study participation:

 - Informed Consent as documented by signature

 - Age 18 years or older

 - Recurrent kidney stone disease (≥ 2 stone events within the last 10 years prior to randomization)

 - Any past kidney stone containing 50% or more of calcium oxalate, calcium phosphate or a mixture of both

Exclusion criteria

The presence of any one of the following exclusion criteria will lead to exclusion of the individual:

 - Pharmacologic prevention for stone recurrence less than 3 months prior to randomization

 - Patients with secondary causes of recurrent calcareous nephrolithiasis including:

  - Severe eating disorders (anorexia or bulimia)

  - Chronic inflammatory bowel disease, bariatric surgery, intestinal surgery with malabsorbtion or chronic diarrhea

  - Sarcoidosis

  - Primary hyperparathyroidism

  - Complete distal tubular acidosis

  - Active malignancy

 - Patients with the following medications:

  - Thiazide or loop diuretics

  - Carbonic anhydrase inhibitors (including topiramate)

  - Xanthine oxidase inhibitors (febuxostat or allopurinol)

  - Alkali, including potassium citrate or sodium bicarbonate

  - 1,25 -OH Vitamin D (calcitriol)

  - Calcium supplementation

  - Bisphosphonates

  - Denusomab

  - Teriparatide

  - Glucocorticoids

 - Obstructive uropathy, if not treated successfully

 - Urinary tract infection, if not treated successfully

 - Chronic kidney disease (defined as CKD -EPI eGFR < 30 mL/min per 1,73 m2 body surface area)

 - Patients with a kidney transplant

 - > 3 gout arthritis episodes within one year prior to randomisation or gout arthritis requiring uric acid lowering therapy

 - Cystinuria at screening

 - Hypokalemia (blood potassium level < 3 mmol/L) at screening

 - Hyponatremia (blood sodium level < 125 mmol/L) at screening

 - Pregnant and lactating women

 - Previous (within 3 months prior to randomization) or concomitant participation in another interventional clinical trial

 - Inability to understand and follow the protocol

 - Known allergy to the study drug