%0 Journal Article %A Chieh-Chun Yang %A Po-Cheng Hung %T Bias in the Methodology: Sleep Quality Is Related to Worsening Knee Pain in Those With Widespread Pain %D 2021 %R 10.3899/jrheum.201165 %J The Journal of Rheumatology %P 303-303 %V 48 %N 2 %U https://www.jrheum.org/content/jrheum/48/2/303.1.full.pdf