114854
Extracorporeal shock wave lithotripsy is a non-invasive treatment of stones in the kidney , gallbladder or liver , using an acoustic pulse .
 stones
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 stones