Got Creaky Knees? Start Walking, if You Don't Want Arthritis Later
By KellyEverson on July 07, 2014
Arthritis. CollinsDictionary.com. Collins English Dictionary - Complete & Unabridged 11th Edition. Retrieved November 24, 2012.
Arthritis: The Nation's Most Common Cause of Disability Centers for disease prevention and health promotion. Retrieved on 2010-01-24