Science writing at its best. Enjoy The Itch by Atul Gawande.
P.S. This artcle is more than two years old and has been linked by others like Guru (http://mogadalai.wordpress.com/) who also linked several other articles by Atul Gawande. I came across it today while looking for progress on phantom limb mirror treatment of V.S. Ramachandran.
P.P.S. Some follow ups of the artcle and much other stuff at http://gawande.com/links