In addition, a growing number of clinics (18-20%) are now run by hospitals or physician groups, who use or hire their own center and administrative personnels or make use of existing supplier centers to serve the staff member population. Lastly, an increasing number of companies are taking part in shared, multi-employer centers, situated either on one employer's area or centrally located.The vendor will build, staff and manage the facility either at the demand of a group of employers or will obtain employers in a defined geographic area. Regardless of the design used, it's key that employer stay participated in company choice, center oversight, strategic and policy instructions. Staffing practices differ from one onsite center to another, though over 60% of facilities are led by a Nurse Professional or Physician's Assistant.