Institution: | (1) Klinik für Orthopädische Chirurgie, Kantonsspital, CH-7000 St. Gallen, Switzerland;(2) Division of Orthopaedic Surgery, McGill University, Montreal, Quebec, Canada;(3) Texas Back Institute, Crawford, Texas, USA;(4) Rehabilitationskrankenhaus, Karlsbad-Langensteinbach, Germany;(5) Hôspital de la Conception, Marseille, France |