TY - JOUR T1 - Clinical features in primary care electronic records before diagnosis of ankylosing spondylitis : a nested case-control study JO - BMC Family Practice PY - 2020/05/06 AU - Bashir MT AU - Iversen L AU - Burton C ED - DO - DOI: 10.1186/s12875-020-01149-2 PB - Springer Science and Business Media LLC VL - 21 IS - 1 Y2 - 2025/08/11 ER -