Back supports for medical purposes; Posterior spinal fixation devices for the treatment of back defects; Supports for the back; Apparatus for orthopaedic purposes; Orthopaedic articles; Orthopaedic strapping; Orthopaedic supports; Therapeutic support devices; Apparatus for use in toning muscles for medical rehabilitation; Exercise apparatus for medical rehabilitative purposes; Neck rolls for medical or surgical use; Orthotic apparatus; Orthotic devices