Drug Use by Music Festival Attendees: A Novel Triangulation Approach Using Self-Reported Data and Test Results of Oral Fluid and Pooled Urine Samples. - Gjerde, Hallvard; Gjersing, Linn; Baz-Lomba, Jose Antonio; Bijlsma, Lubertus; Salgueiro-González, Noelia; Furuhaugen, Håvard; Bretteville-Jensen, Anne Line; Hernández, Félix; Castiglioni, Sara; Johanna Amundsen, Ellen; Zuccato, Ettore (Substance Use & Misuse, 2019)