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Pohl, Heiko; Do, Thien Phu; García-Azorín, David; Hansen, Jakob Møller; Kristoffersen, Espen Saxhaug; Nelson, Sarah E; Obermann, Mark; Sandor, Peter S; Schankin, Christoph J.; Schytz, Henrik Winther; Sinclair, Alexandra; Schoonman, Guus G; Gantenbein, Andreas R (2021). Green Flags and headache: A concept study using the Delphi method. Headache, 61(2), pp. 300-309. Wiley-Blackwell 10.1111/head.14054
