title: Author's reply.
authors.affiliation: Spine Service, Indian Spinal Injuries Centre, Sector C, Vasant Kunj, New Delhi, India.
authors.forename: Harvinder S
authors.initials: HS
authors.lastname: Chhabra
authors.affiliation: Department of Basic Research, Indian Spinal Injuries Centre, Sector C, Vasant Kunj, New Delhi, India.
authors.forename: Kanchan
authors.initials: K
authors.lastname: Sarda