What is the fine-grained topic of the following text: Dr. Janssen founded the Center for Spine and Orthopedics in the early 1990s after completing two fellowships in spine surgery — one at the Lakewood (Colo.) Orthopedic Clinic and another in St. Gallen, Switzerland — and an orthopedic residency at the Medical College of Georgia in Augusta. Only return the topic.
Dr. Janssen's founding of the Center for Spine and Orthopedics.