Abbreviations used:ALT ( alanine aminotransferase), AST ( aspartate aminotransferase), CI ( confidence interval), IRR ( incidence rate ratio), WBC ( white blood cell count)
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Funding sources: Funded in part through National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) grant 1P30-AR-069589-01 . Dr Barbieri is supported by the NIAMS of the National Institutes of Health under award number T32-AR-007465 and receives partial salary support through a Pfizer Fellowship in Dermatology Patient Oriented Research grant to the Trustees of the University of Pennsylvania. Dr Takeshita is supported by NIAMS K23-AR-068433 . The funders had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; preparation, review, or approval of the manuscript; and decision to submit the manuscript for publication.
Conflicts of interest: Dr Takeshita receives a research grant from Pfizer Inc (to the Trustees of the University of Pennsylvania) for work that is unrelated to this study and has received payment for continuing medical education work related to psoriasis that was supported indirectly by Eli Lilly and Novartis . Dr Barbieri, Dr Shin, Shiyu Wang, and Dr Margolis, have no conflicts of interest to disclose.
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