Electronic Health Records: Which Practices Have Them, and How Are Clinicians Using Them? - Steven R. Simon; Madeline L. McCarthy; Rainu Kaushal; Chelsea A. Jenter; Lynn A. Volk; Eric G. Poon; Kevin C. Yee; E. John Orav; Deborah H. Williams; David W. Bates (AMIA, 2006)