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Adapteret fra:
Metabolic evaluation and medical management of upper urinary tract stone disease. Guidelines from the Scandinavian Cooperative Group for Urinary Stones.Osther PJ, Grenabo L, Haraldsson G, Holmberg G, Lindell O, Mogensen P, Schultz A, Ulvik NM.
Scan J Urol Nephrol 1999; 33: 372-81.