%0 Journal Article %A Robert Froud %A Martin Underwood %T Usual care in back pain trials %D 2009 %R 10.3399/bjgp09X419574 %J British Journal of General Practice %P 209-210 %V 59 %N 560 %U https://bjgp.org/content/bjgp/59/560/209.3.full.pdf