Just a note of caution. On that link there is a lab report(http://www.angelhealingcenter.com/GallstonePictures.html). I contacted the lab to ask about it, and they told me that the report had been altered.
Just look up their website in google, and send them a message.
You'll notice that the webpage has the same address as in the lab report.
Here's the lab's website: