RT Journal T1 Quickstats: From the national center for health statistics percentage of emergency department visits by persons aged ≤18 years, by primary expected source of payment—national hospital ambulatory medical care survey, united states, 2001-2002 to 2009-2010 JF JAMA JO JAMA YR 2013 FD February 20 VO 309 IS 7 SP 653 OP 653 DO UL http://dx.doi.org/ AB