Our Network: St. Luke's University Health Network (SLUHN) is a non-profit, regional, fully integrated, nationally recognized network providing services at 16 campuses and more than 350 sites in Lehigh, Northampton, Carbon, Schuylkill, Bucks, Montgomery, Berks, Monroe and Luzerne counties in Pennsylvania and Warren and Hunterdon counties in New Jersey. Practice: Progressive Physician Associates (PPA) is a large interdisciplinary private practice group of over 100 providers that includes Diagnostic Radiologists, Interventional Radiologists, Vascular Surgeons and Advanced Practitioners.