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Boef, Anna G C; le Cessie, Saskia; Dekkers, Olaf M; Frey, Peter; Kearney, Patricia M; Kerse, Ngaire; Mallen, Christian D; McCarthy, Vera J C; Mooijaart, Simon P; Muth, Christiane; Rodondi, Nicolas; Rosemann, Thomas; Russell, Audrey; Schers, Henk; Virgini, Vanessa; de Waal, Margot W M; Warner, Alex; Gussekloo, Jacobijn; den Elzen, Wendy P J (2016). Physician's Prescribing Preference as an Instrumental Variable: Exploring Assumptions Using Survey Data. Epidemiology, 27(2), pp. 276-283. Wolters Kluwer Health, Lippincott Williams & Wilkins 10.1097/EDE.0000000000000425