1. Department of Orthopaedic SurgeryUniversity of Pittsburgh Medical CenterPittsburghPennsylvania
2. Department of Orthopaedic Spine SurgeryAlbert Einstein HospitalSão PauloBrazil
3. Brigham and Women's HospitalBostonMassachusetts
4. Department of Physical Medicine and RehabilitationUniversity of Pittsburgh Medical CenterPittsburghPennsylvania