RT Journal Article SR Electronic T1 Glucosamine and chondroitin sulphate did not improve pain in osteoarthritis of the knee JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 115 OP 115 DO 10.1136/ebm.11.4.115 VO 11 IS 4 YR 2006 UL http://ebm.bmj.com/content/11/4/115.abstract AB