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Mikolajczyk, Rafael T., Maxwell, Annette E., El Ansari, Walid, Naydenova, Vihra, Stock, Christiane, Ilieva, Snezhana, Dudziak, Urszula and Nagyova, Iveta (2008) Prevalence of depressive symptoms in university students from Germany, Denmark, Poland and Bulgaria. Social Psychiatry and Psychiatric Epidemiology, 43 (2). pp. 105-112. doi:10.1007/s00127-007-0282-0