Is Phantom Limb Pain Psychological or Biological?
First
http://www.zielinskifam.com/lit/gumc_nsci_papers/ramachandran_prslb_phant_96.pdf
Second
https://academic.oup.com/painmedicine/article/11/1/133/1845477
Third
https://www.hindawi.com/journals/prt/2011/864605/
The essay is about 1000 words
