World Head transplant doctors Xiaoping Ren and Sergio Canavero claim spinal cord progress March 27, 2019March 28, 2019Kim Hjelmgaard, USA TODAYComments Off on Head transplant doctors Xiaoping Ren and Sergio Canavero claim spinal cord progress Surgeons who wanted to perform the world’s first human head transplant claim progress with 'irreversible' spinal cord injuries.