kidney lithotripsy : ucla medical center , los angeles ; new york hospital-cornell university , new york city ; mayo clinic , rochester , minn. ; hospital of the university of pennsylvania , philadelphia ; bethesda hospital , cincinnati ; hca stone center , knoxville , tenn. ; lahey clinic , boston ; methodist hospital , indianapolis ; litho clinic , houston ; northern california kidney stone center , san jose , calif. ; bowman gray school of medicine , winston-salem , n.c. ; and virginia mason hospital , seattle .