In addition, a growing number of centers (18-20%) are now run by health centers or doctor groups, who use or employ their own center and administrative staffs or use existing supplier facilities to serve the employee population. Finally, an increasing number of employers are taking part in shared, multi-employer centers, situated either on one company's location or centrally situated.The vendor will build, personnel and manage the center either at the request of a group of companies or will get companies in a specified geographical area. Regardless of the model utilized, it's key that company stay taken part in service provider selection, center oversight, tactical and policy instructions. Staffing practices differ from one onsite center to another, though over 60% of facilities are led by a Nurse Professional or Doctor's Assistant.