Identifying the mechanism of missingness for unspecified diabetic retinopathy disease severity in the electronic health record: an IRIS® Registry analysis. - Meghan Hatfield; Thai Hien Nguyen; Richard Chapman; Alayna C. Myrick; Theodore Leng; Michael Mbagwu; Shrujal Baxi; Aracelis Z. Torres; Durga S. Borkar (J. Am. Medical Informatics Assoc., 2023)