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Contributors ELC was responsible for conception, patient consent, drafting and submitting the final manuscript. LMW performed histological assessment and immunostaining of specimens, and provided histology images. HB performed radiological interpretation and provided radiology images. RWC and JC were responsible for patient investigation and management. All authors were members of the IgG4 multidisciplinary team and critically reviewed and approved the final manuscript.
Funding ELC received funding from the Wellcome Trust [095160/Z10/Z].
Competing interests None declared.
Patient consent Obtained.
Ethics approval Oxfordshire Research Ethics Council.
Provenance and peer review Not commissioned; externally peer reviewed.
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