Question-and-Answer Session
[Operator Instructions]. Our first question comes from Eli Kammerman. Sir your line is open.
Eli Kammerman - Cowen & Co.
Thanks very much. My first question is related to one of the procedures that you didn't talk about and that's head and neck surgery. The ones notable training course at the international surgeons meeting this past week, is that on the radar as contributing significantly to procedure increases this year?
Aleks Cukic - Vice President, Business Development and Strategic Planning
It is not on the radar to be a significant contributor this year. It is as you called out, it is definitely on the radar of our customers and there has been some work that has been done on the procedure but as a remainder, we do not have FDA clearance for that indication. But what we hear from people that have their IDEs in place is that there are some potentially high value adds for the patient value in that application. So, we are definitely watching it. But, it is not going to be a significant contributor this year.
Eli Kammerman - Cowen & Co.
Okay. And my other question is there was the higher than usual number trade-ins this quarter at 6 units. Did you run a special promotion, which encouraged trade-ins or how do you account for this sudden spike in trade-ins?
Marshall L. Mohr - Senior Vice President and Chief Financial Officer
There wasn't a special promotion, there are certainly were more this quarter than in previous quarters. Over the past four quarters, it's ranged somewhere between 0 and 2 and so six this quarter was probably a high watermark. We think it's going to vary and it really depends on which customers out there are looking to have a kind of transaction. We think we'll have some in the future, but it's hard to say how many quarter-to-quarter.
Lonnie M. Smith - Chairman and Chief Executive Officer
Well, and if you all look at the standard, I mean the standard's been out there since 1990 in Europe and when a hospital decides to buy second system often, they are thinking about also standardizing and so we will... this is part of our long-term plan is that we will have more trade-ins and people will move to the more capable and later versions of the system.
Eli Kammerman - Cowen & Co.
Okay. Then on a related note, what's your average revenue capture per trade-in?
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