68544
A specific salt of EDTA , known as sodium calcium edetate , is used to bind metal ions in the practice of chelation therapy , such as for treating mercury and lead poisoning .
 mercury, lead poisoning
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:
 mercury, lead poisoning