%0 Journal Article %B Spine J %D 2017 %G eng %N 7 %P 905-912 %R 10.1016/j.spinee.2017.02.009 %T Chronic low back pain and the risk of depression or anxiety symptoms: insights from a longitudinal twin study. %V 17 %1 https://www.ncbi.nlm.nih.gov/pubmed/28267634?dopt=Abstract