Enrichment sampling for a multi-site patient survey using electronic health records and census data. - Nathaniel D. Mercaldo; Kyle B. Brothers; David S. Carrell; Ellen Wright Clayton; John J. Connolly; Ingrid A. Holm; Carol R. Horowitz; Gail P. Jarvik; Terrie E. Kitchner; Rongling Li; Catherine A. McCarty; Jennifer B. McCormick; et al. (J. Am. Medical Informatics Assoc., 2019)