[1
]
Spine Unit, Department of Orthopedic Surgery, Hospital Universitario La Paz, Madrid,
Spain.
[2
]
Spine Research Unit, Vall d'Hebron Institute of Research, Barcelona, Spain.
[3
]
Spine Surgery Unit, Acibadem Maslak Hospital, Istanbul, Turkey.
[4
]
Spine Surgery Unit, Pellegrin University Hospital, Bordeaux, France.
[5
]
Department of Orthopedics, Schulthess Klinik, Zurich, Switzerland.
[6
]
Orthopedic Spine Unit, Ankara Spine Center, Ankara, Turkey.
[7
]
Spine Surgery Unit, Hospital Universitario Vall d'Hebron, Barcelona, Spain.