%0 Journal Article %B BMC Musculoskeletal Disorders %D 2011 %G eng %M 21854620 %P 193 %T Back complaints in the elders (BACE); design of cohort studies in primary care: an international consortium %V 12 %7 2011/08/23 %@ 1471-2474 (Electronic)1471-2474 (Linking)