Santillana, M.
Nguyen, A. T.
Louie, T.
Zink, A.
Gray, J.
Sung, I.
Brownstein, J. S.
Article History
Received: 31 December 2015
Accepted: 20 April 2016
First Online: 11 May 2016
Competing interests
: I.S., A.Z. and J.G. were employed by athenahealth at the time this research was performed. M.S., A.T.N., T.L. and J.S.B. declare no potential conflict of interest.