Demographic and illness characteristics of the sample. Peter J. Schulz Uwe Hartung Silvia Riva 10.1371/journal.pone.0078029.t001 https://plos.figshare.com/articles/dataset/_Demographic_and_illness_characteristics_of_the_sample_/840343 *<p>Have had back pain for more than 3 months.</p>**<p>More than one answer.</p><p>Nā€Š=ā€Š1259 unless otherwise noted.</p> 2013-11-01 03:13:25