1. Epidemiology of urolithiasis;Blacklock,1982
2. Incidence of upper urinary tract stones;Ljunghall;Miner Electrolyte Metab,1987
3. The frequency of urolithiasis in hospital discharge diagnosis in the United States;Sierakowski;Invest Urol,1978
4. Renal stone epidemiology;Johnson;Kidney Int,1979
5. The natural history of calcium urolithiasis;Coe;JAMA,1977