Observational studies based on cohorts built from electronic health records (EHR) form the backbone of our current understanding of the risk of new-onset diabetes following COVID. EHR-based research is a powerful tool for medical research but is subject to multiple sources of bias. In this viewpoint. we define key sources of bias that threaten the validity of EHR-based research on thi... https://foldlyers.shop/product-category/sla/