Dr. Hallie J. Beyer

Dr. Doberstein is a board-certified physician specializing in internal medicine. He attended Temple University, where he received his medical degree. Dr. Doberstein completed his residency at Temple University Hospital, then completed a chief resident position at Temple University. He is certified by the American Board of Internal Medicine. Dr. Doberstein is rated as an Advanced provider by MediFind in the treatment of Febrile Neutropenia. His top areas of expertise are Familial Hypocalciuric Hypercalcemia Type 1, Milk-Alkali Syndrome, Hypercalcemia, and Idiopathic Hypercalciuria.

Robert Sullivan, MD, is certified in internal medicine by the American Board of Internal Medicine. He practices at Blair Medical Associates, Station Medical Center and is affiliated with UPMC Altoona. He completed his fellowship and residency at the University of Cincinnati College of Medicine and his medical degree at the University of Illinois College of Medicine. Dr. Sullivan is rated as an Advanced provider by MediFind in the treatment of Febrile Neutropenia. His top areas of expertise are Peripheral Artery Disease, Lyme Disease, Osteomyelitis, Osteomyelitis in Children, and Hemorrhoidectomy.

Hassan Zammam, MD, is certified in internal medicine by the American Board of Internal Medicine. He practices at Blair Medical Associates, Station Medical Center and is affiliated with UPMC Altoona. He completed a fellowship at Allegheny University Hospitals, residency at Bon Secours Hospital, residency at Damascus University, and his medical degree at Damascus University Medical College. Dr. Zammam is rated as an Advanced provider by MediFind in the treatment of Febrile Neutropenia. His top areas of expertise are Melorheostosis with Osteopoikilosis, Melorheostosis, Osteopenia, Colonoscopy, and Gastrostomy.