In addition, a growing variety of clinics (18-20%) are now run by medical facilities or doctor groups, who use or employ their own center and administrative personnels or utilize existing service provider facilities to serve the employee population. Lastly, an increasing variety of companies are taking part in shared, multi-employer centers, located either on one employer's location or centrally located.The supplier will build, personnel and manage the facility either at the request of a group of employers or will obtain companies in a defined geographic location. Regardless of the design used, it's crucial that company stay taken part in supplier choice, center oversight, tactical and policy instructions. Staffing practices vary from one onsite center to another, though over 60% of centers are led by a Nurse Specialist or Physician's Assistant.