The series comes from the 'Current Employment Statistics (Establishment Survey)'
The source code is: CEU6562140001
Source: US. Bureau of Labor Statistics
Release: Employment Situation
US. Bureau of Labor Statistics, All Employees: Education and Health Services: Outpatient Care Centers [CEU6562140001], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/CEU6562140001/, July 30, 2015.