Methylmethacrylate inter-facetal and inter-vertebral body spacers for cranio-vertebral junction and various spine surgeries: Technical note. - Jha, Deepak; Garg, Mayank; Bhaskar, Suryanarayanan; Gosal, Jaskaran; Shukla, Kartikeya; Chugh, Vinay; Khera, Pushpinder; Bhatia, Pradeep (Asian Journal of Neurosurgery, 2021)