Additional file 2: of The association between headache and low back pain: a systematic review Arani Vivekanantham Claire Edwin Tamar Pincus Manjit Matharu Helen Parsons Martin Underwood 10.6084/m9.figshare.8874902.v1 https://springernature.figshare.com/articles/journal_contribution/Additional_file_2_of_The_association_between_headache_and_low_back_pain_a_systematic_review/8874902 Characteristics of excluded studies for wrong outcome. (DOCX 18 kb) 2019-07-15 05:00:00 Primary chronic headaches Persistent low back pain Epidemiology Chronic pain syndromes