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Correspondence to: Dr US Kesmodel, Department of Public Health, Section of Epidemiology, Aarhus University, Bartholins Allé 2, 8000 Aarhus C, Denmark; firstname.lastname@example.org
Sources of funding: The Centers for Disease Control and Prevention (CDC), the Danish National Board of Health, the Lundbeck Foundation, Ludvig & Sara Elsaas’ Foundation, the Augustinus Foundation and Aase & Ejnar Danielsen's Foundation.
Competing interests None.
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