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Validation of sick leave measures: self-reported sick leave and sickness benefit data from a Danish national register compared to multiple workplace-registered sick leave spells in a Danish municipality

Christina Malmose Stapelfeldt*, Chris Jensen, Niels Trolle Andersen, Nils Fleten and Claus Vinther Nielsen

BMC Public Health 2012, 12:661  doi:10.1186/1471-2458-12-661