An 8 years old child suffering from recurrent attacks of polyuria since childhood presents to the pediatrics OPD. On examination, the child has short stature. Vitals and B.P. are normal. S. Creatinine – 6 mg/dL, HCO3 – 16 meq/L, S Na+ – 134 meq/L. On USG, bilateral small kidneys are seen. Diagnosis is:

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