Hello! ...and Welcome to the Chronic Pain forum!
I did a quick search for you on this. Please feel free to check it out and search more on this subject.
Select the search button in the upper righthand corner of the forum page, and type in your search word.
Good luck!...and again Welcome!
Moderator Chronic Pain Forum
"Snowflakes are one of nature's most fragile things, but just look at what they can do when they stick together"