In addition, a growing number of clinics (18-20%) are now run by medical facilities or doctor groups, who utilize or hire their own clinic and administrative staffs or use existing service provider centers to serve the staff member population. Finally, an increasing number of employers are taking part in shared, multi-employer centers, located either on one employer's place or centrally located.The supplier will construct, staff and handle the center either at the request of a group of employers or will obtain companies in a specified geographic location. Regardless of the model used, it's key that employer stay engaged in supplier 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 Specialist or Doctor's Assistant.