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4. Economic evaluation of extracorporeal shock-wave lithotripsy, percutaneous ultrasonic lithotripsy, and standard surgical treatment of urolithiasis—a Canadian perspective;Labelle;Clin Invest Med,1987
5. Cost effectiveness of extracorporeal shock wave lithotripsy and percutaneous nephrostolithotomy for medium sized kidney stones: A randomized clinical trial;Carlsson;Scan J Urol,1989