Статистика по медицине неотложной помощи: см. Eric W. Nawar, Richard W. Niska, and Jiamin Xu, "National Hospital Ambulatory Medical Care Survey: 200 Emergency Department Summary", Advance Data from Vital and Health Statistics, Centers for Disease Control, June 29,2007; также часть информации была получена в Federal Agency for Healthcare Research and Quality (AHRQ) и почерпнута из отчетов этой организации, в частности: Pamela Horsleys and Anne Elixhauser, "Hospital Admissions That Began in the Emergency Department, 2003", и Healthcare Cost and Utilization Project (H-CUP) Statistical Brief no. 1., February 2006.
