someone named hedgehog (could that be the same person who posted here a long time ago?) said that imi (should be ims?) data shows a certain amount of vis sales. i have no idea if his numbers are correct, but i used to work for a generic parenterals company and we used ims data for the purpose of making decisions on which products to go after. and it was very, very expensive. i mentioned ims here a very long time ago.