Are you using IRIS for Health image?
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I don't see it mentioned in the article, there is also a working demo during the contest: http://sleeptracker.banksiaglobal.com. No need to give it your real personal information or email, it's just a demo to click around.
If you haven't done it yet, go to the contest page and vote for the best projects! https://openexchange.intersystems.com/contest/31