And the stones should be non-calcified. There are some others that use a similar machine for calcified gallstones with some kind of 50% success rate. Stones number? It should be one, according to our criteria. One stone between 5 to 20 millimeter in size (FDA approval is 4mm to 20mm). So what we do, we put the gallstones, really, under a microscope. And like I said at the beginning, the percentage we're going to select is going to be about 10 to 15%, not every gallstone for FDA protocol. Previously our group, Mountain Center Group, all around the world they used this machine for multiple stones, which we can discuss later on. At this time we are not allowed to do that but when you do that your success rate is less than 80%. I will show you some numbers.