Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) HAY EM,Selective polyclonal increase of immunoglobulin G1 subclass : a link with Sjogren's syndrome,Ann Rheum Dis,,,1990,49,,373-377,https://cir.nii.ac.jp/crid/1570572701504367744,https://doi.org/10.1136/ard.49.6.373