In addition, a growing number of clinics (18-20%) are now run by healthcare facilities or physician groups, who use or hire their own clinic and administrative staffs or utilize existing provider centers to serve the employee population. Finally, an increasing variety of companies are taking part in shared, multi-employer centers, located either on one employer's place or centrally situated.The supplier will construct, personnel and manage the facility either at the request of a group of companies or will solicit employers in a defined geographic location. Despite the design used, it's crucial that company stay engaged in supplier choice, center oversight, tactical and policy direction. Staffing practices differ from one onsite center to another, though over 60% of centers are led by a Nurse Professional or Physician's Assistant.