[Welcome to Cornerstone Medical Group Cornerstone Medical Group is composed of 11 board-certified family practice physicians, and has offices in Wheaton and Geneva, Illinois. Our services include well baby care, vaccinations, sport exams, wellness exams, radiology, laboratory, physical therapy, geriatric care, preventive care, and women's and children's care. Our physicians are on staff at Central DuPage Hospital and Delnor-Community Hospital, and include Drs. Jon Aagaard, Steven Armbrust, Steven Burandt, Victoria Johnson, Dorothy Jones, Beth Larson, Cathy Munro, Maritsa Pedersen, Lisa Piccione, and Ronald Severino.]