Challenges and opportunities using online portals to recruit diverse patients to behavioral trials. - Tabriz, Amir Alishahi; Fleming, Patrice Jordan; Shin, Yongyun; Resnicow, Ken; Jones, Resa M; Flocke, Susan A; Shires, Deirdre A; Hawley, Sarah T; Willens, David; Lafata, Jennifer Elston; Alishahi Tabriz, Amir (Journal of the American Medical Informatics Association, 2019)