Many different diseases,conditions and injuries can cause chronic pain, from back problems to burns.

VOA: special.2009.02.10

Multiple sclerosis is different from many other diseases.

VOA: special.2009.01.06

"I'd have to say that equally on both sides of the coin, my successes with regards to my science are the discovery of the genetic basis of a number of different human skin diseases, using very unconventional approaches, which are now approaches in medical textbooks, but at the time, they were very unconventional."

VOA: standard.2010.03.29