So, it varies. I think there are a variety of issues. Right now, if you look at this business from the providers point of view at the level of the fertility center itself, it’s a very high fixed cost business that’s very profitable once you cover your fixed costs, so the incremental new patient is very important to the center and the margins are very high at the provider level. It’s really important to continue driving new patients and driving growth in the center, because your costs are going up, and you’ve got staff, you've got insurance, so it’s an expensive proposition and continuing to drive new patient volume is an important, very important criteria for these centers and the physicians who own them to continue doing well financially. It’s important too from a clinical point of view because this is a subspecialty that does require certain level of volume of procedures and experience for the physicians to really do a good job clinically. You have to keep up your skill by treating a certain number of patients. So for a whole host of reasons, size really doesn’t matter in this business, and physicians do come. Initially over the years they came to us because we did have a very strong track record in delivering patient volume, and even now compared to our historical performance the growth rate has come down. We still year in and year out outperform the market as a whole in terms of growth, and usually at least two times we are growing, our centers are growing two times if not more, two to three times the pace of the market as a whole, so physicians do still come to us for that reason. But more and more they are coming to us looking for at least partially an exit strategy, but also for the infrastructure that we can deliver that can help them improve the efficiency of their operation, because efficiency now is awfully important. When you are growing at 15%, 20%, 30% a year, you can be a little sloppy in operations. Now a single digit growth, it’s very important to have good, really good, solid, efficient operation, so that you can improve your profitability a little bit more.