Effectiveness of a fourth dose of COVID-19 mRNA vaccine in patients with systemic autoimmune rheumatic diseases using disease-modifying antirheumatic drugs: an emulated target trial

https://www.thelancet.com/journals/lanrhe/article/PIIS2665-9913(23)00272-2/fulltext?dgcid=hubspot_email_covidalerts&utm_campaign=lancetcovid22&utm_medium=email&_hsmi=283901121&_hsenc=p2ANqtz-8_E6p1jk6aHdKCSWN1rcsJKtXkVT-xGFYI2mx_dMeABIAZLGYnhX-KHzcHQq1cucirfR8hdbzlJbCVRAoHSVgRS_oSXg&utm_content=283899141&utm_source=hs_email