Data are for the U.S.
Source: Health, United States, 2016, table 53 [PDF – 9.8 MB]
Source: National Ambulatory Medical Care Survey: 2014 State and National Summary Tables, table 16 [PDF – 613 KB]
Source: National Hospital Ambulatory Medical Care Survey: 2011 Outpatient Department Summary Tables, table 11 [PDF – 330 KB]
Source: Deaths: Final Data for 2014, tables 10, 11 [PDF – 4.4 MB]