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. 2017 May 6;7(5):e012651. doi: 10.1136/bmjopen-2016-012651

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://www.bmj.com/company/products-services/rights-and-licensing/

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Flow chart of the construction of Copenhagen Airport Cohort. *Novia (Novia Denmark, handling, company), SAS (SAS Ground Service, handling company), CPH (Copenhagen Airport), Kastrup (3F Kastrup—local union), NUGSP (National Union of Guards and Security Personnel), reference group includes 3F (Mølleåen, 3F Kastrup and 3F Lager Post and Service Union (LPSF) all organises workers in neighbouring areas of Copenhagen). **Not assessed for eligibility due to: invalid CPR number, missing information on occupation, administrative/management/academic occupations, persons with leave of absence, employment before 15 years of age, men who have never stayed in Denmark under the study period (1990–2012), employment after 31 December 2012, same entry and exit date, dead before employment and dead before 1990.