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Article History

Received: 23 January 2015

Accepted: 30 April 2015

First Online: 8 June 2015

Competing interests

: This work was completely funded by federal and foundation sources and the authors have no competing financial interests. However, one of the funding sources cited (National Institutes of Health) is a joint grant with the company Paratus Diagnostics, LLC (Austin, USA). Paratus did not contribute to the current work, but they are our collaborators in this general area. We do not receive funding from them, nor do we have equity in or consulting fees from this company; they are solely collaborators. Nonetheless, out of an abundance of caution we are informing you of this connection. In the end, though, we believe that it is appropriate to say that the authors have no competing financial interests