Thora, A., N. Bhatnagar, A. Tiwari, P. Lingaiah, and N. Rustagi. “Use of Henna As a Durable Pre-Operative Skin Marker for Accurate Localisation of Vertebral Level in Spine Surgery”. International Journal of Research in Orthopaedics, vol. 3, no. 3, Apr. 2017, pp. 461-5, doi:10.18203/issn.2455-4510.IntJResOrthop20171467.