Electronic health record closed-loop referral (“eReferral”) to a state tobacco quitline: a retrospective case study of primary care implementation challenges and adaptations oleh Mark E. Zehner, Julie A. Kirsch, Robert T. Adsit, Allison Gorrilla, Kristine Hayden, Amy Skora, Marika Rosenblum, Timothy B. Baker, Michael C. Fiore, Danielle E. McCarthy